I agree with your general point that normal education could be made much more interesting as well. Although it would partially defeat the purpose of education to not prepare students for the boredom and rigid schedule of ordinary work early on.
I think you're right about the need to support the specially gifted kids and that generally means treating them differently as you suggest. However I think there is scope for altering the current system to make it more interesting for the rest of the kids and possibly stir up/inspire/awaken whatever more limited "giftedness" they might have. If the aim is solely to prepare kids for the the boredom and rigidity of ordinary work I'd say we're not getting value for money. This is particularly so in places high percentage of people graduating with Bachelors or even Masters degrees.
Further, if the teacher at school with their class of 30 did nothing but tutor the students, each student would get 10 minutes (in a 5-hour school day). You as a parent can beat that the 1st 11 minutes of your home-school day. That leaves you hours of the day for moving ahead of the classroom.
Many (most) parents don't have the resources to do that. If we don't make adequate provisions for the exceptionally gifted, we're squandering a lot of valuable talent. Nobody would tolerate a child with an IQ of 55 being made to sit in a mainstream classroom, because it's obvious that they wouldn't get anything vaguely resembling an education; we should be equally outraged about a child with an IQ of 145 in that mainstream classroom.
Getting bored and actually having worse grades for these students is a real thing. Especially in classes that need effort and not intellect. On the other hand, forcing intellectual challenging activities (like solving math puzzles, playing chess or building robots) isn't fun for a lot of people that do not like to challenge their brain for fun.
Personally my school grades skyrocketed from slightly above average to the 95% percentile in the last two school years, which was at the same time as I was allowed to participate in a junior student program and was spending one day per week at campus instead of school. I wasn't doing more for school, based on attendance actually less, I was just more inclined to listen and interested in learning, while I was being challenged by my university lectures (basic algorithms, data structures, databases and data modeling).
One school we visited has decided to try a different direction to present the material: normally they start with the basic concepts and build bottom-up to the big overview. For gifted kids, they want to try the opposite: start with the overview and zoom in on the basic concepts from there. I can see how that might work better for gifted kids, as they know what they're working towards and trying to figure out what it's made of, whereas other kids might get lost along the way.
I think the best education system is one that keeps an eye on individual children's needs and talents.
Which is what most "education for the gifted" programs boil down to: meeting individual needs.
You would get some additional gifted children, but it's a question of cost vs returns. I agree that programs like that would be cool to have for kids, but I'm not entirely sold on whether they would help.
What you say is true. As much as some don't want to admit it not everybody has the same potential (at least academically) and that's okay. With regards to the programs I don't think the aim should be solely to unearth some hidden geniuses. I think it should be to give every kid a rich and broad learning experience as an aim in itself. And secondly to enable to fulfill whatever potential they might.
My best friend, while in highschool, had routine problems in core classes. Simple algebra? Forget about it. Spelling? Grab a bunch of letters and pray they slam together right. Instead, let him at something that interested him, and it was amazing. When he was 15, he had already rebuilt a couple engines and a transmission and was getting an old Corvette up and running that he was giving by family. If you heard a plane go over head, he could identify the sound of the engine, name the model of the plane, and rattle off the history of it, leading back to ww2 or whatever. At junior college, he took a geology class and suddenly he was academic. He saw how math helped and passed through trig. His spelling and essayship became solid as he saw the value in communication about geology.
The long story short: people, even those who might not appear promising, can shine when exposed to something that interests them. Education should be broad and varied at the beginning to help kids find what interests them. A few lucky ones will learn to be interested in most things and for them, most schooling will be easy.
The statement that you’ll get “more” gifted students if all the programs run that way is mostly just a clever way to observe that current efforts to identify which students are gifted, are probably missing some kids with untapped potential.
In addition there is plenty of evidence that more engaging pedagogy will get more out of students, even those of average potential. The biggest impediment to that is probably finding teachers who are capable of teaching that way consistently across the required range of subjects.
If you take the reference population to the world population, then it's possible for Lake Wobegonians to be above average in some things.
So how do you teach to a class like this? The current trendy solution for this is supposed to be 'differentiation'. [1] There's a lot of fancy research and terminology associated with it, but it's a very simple idea - approach topics in a way appropriate to the aptitude of the group whom is learning. It's an extreme burden on the teacher and there's scant evidence of it providing any benefit.
However, tracking [2] is another solution. Tracking is essentially dividing a single group of children based on aptitudes. And unlike differentiated instruction there is substantial evidence of this in both directions. By both directions I mean that above average aptitude students tend to overperform even more when also surrounded by other above average students. But there is also substantial evidence showing that these students start to underperform once placed back into educational environments with lower performing students. The main argument against tracking is are primarily related to equality of result instead of equality of opportunity. E.g. - aiming for everybody performing the same as a goal, rather than everybody performing to the max of their individual potential. That is, in my opinion, very literally a 'Brave New World' style dystopia - hamstring overperformers to try to bring everybody down to the same scale of performance.
And so tracking gets back to the question at hand. When you jam everybody together, 'gifted for everybody', it's not the case that you retain the same level of achievement with even more people able to express their aptitude. Instead you end up a situation where everybody starts getting pulled down by the lower performing individuals. In effect instead of the desired result of "magically seeing more gifted children" you may very well end up seeing fewer.
[1] - https://en.wikipedia.org/wiki/Differentiated_instruction
[2] - https://en.wikipedia.org/wiki/Tracking_%28education%29
(Of course, now I'll get a bunch of teachers commenting that they believe in nurture over nature, but c'est la vie.)
There's (I believe) plenty of value in exposing children to other children for socialization, but I'm not sure this needs to be at the same time as they're learning, rather than via play and activities designed to promote interaction, rather than learning per-se.
Such a system could effectively flip teaching where teachers facilitate and help with questions while the software ensures the "best in class" content is provided and assessed.
I still think about building that from time to time, but life and work don't leave me with the time to start building that. 10 years ago, I got a little ways into the engine for it for an algebra course and that was it.
(Apologies that it is only in Dutch).
The adaptive software pushes each child optimally for their individual learning rate. Their teachers can monitor their progress at a very granular level and give individual attention in a targeted way. The overall progress of the class can be compared with all other classes across the country.
Tangent - if you haven't read Holt's "how children fail", it's a must-read (for teachers and parents alike).
"What may surprise you are the implications for teaching that follow. You'll learn why it's more useful to view the human species as bad at thinking rather than as cognitively gifted."
Quoted from Why Don't Students Like School? by Daniel T. Willingham.