The key idea though was that it was always just a game, never a chore. We'd put the cards back BEFORE she got bored of them.
She could read a 400+ page novel in a day at age 11. I can't even come close to that.
Teaching children to read is weirdly controversial though.
Some people may enjoy their childhood, but I don't see why they wouldn't similarly enjoy life as younger adults. Kids learn to read earlier, then they move on to more productive pursuits earlier.
If anything, I think it's insane that we encourage people to behave like children well into their 20's (c.f. college students complaining about costumes that are too scary). Historically we didn't do this; the real question is what is the long term effect of treating 15-22 year olds like children.
edit: I had no patience for it but would spend most of my time building things out of wood/nails and legos.
PS: I also started to speaking at 3. There seems to be a huge emphasis on progressing as fast as possible, but in the long term a year or two has little meaning.
I think that being taught some stuff at home might have stunted the development of my time management skills, because I could always complete the work in a very small part of the assigned time.
Mum had taught me some basic mathematical manipulations and "short-cuts", and I remember for a while I was ahead of the class in that too, again I wasn't bored though, because I just completed the problems quickly and then did my own thing. The problem was, when the level of difficulty caught up to my skill level again in high school, I was used to having time to muck around in class, and I never put in enough time and effort to finish the assigned work.
When I eventually have kids, I'll teach them anything they ask about, or need help with, but I'm going to trust their teachers with their core subjects by default.
The way I see it, the school material will be pretty straightforward, and easily remediated, but soft skills and self discipline are developed early on, and should not be interrupted for the sake of knowing how to simplify a fraction a year early.
edit:
Thinking about it more, it probably wasn't just my Mum that had made class too easy, the pace was probably a bit too slow for me anyway. When I entered high school, I was put into the advanced stream/track, but by that time my poor study habits were already formed. Perhaps there should have been multiple streams in primary school also.
OK I'll admit dorkiness in public, I loved Tom Swift books when I was a little boy. Couldn't have had my childhood without reading Tom Swift books, wouldn't trade it for anything. The first book I ever sat down and read front to back was the one with the triphibian atomic car. I was probably about 5. Do not want to hear bragging along the lines of "my first book was the Silmarillion at age 2" but I'm sure this was not a unique childhood experience, especially here.
My response to the question of "what will happen if they learn to read a year earlier" is that they will be a year ahead in learning to read of the previous generation.