Lots of people object to what you are saying, but I'm relieved to hear someone say it. Many 'specializations' are actually worlds unto themselves, with endless amounts of things to learn. They are fun to explore (for a kid of a specific bent) and there is no reason not to explore them as early as possible, just as I wasted no time in taking my toddler on hikes to see parts of the world different than where we live. In my own life, there were many things I regretted learning about until it was too late to devote much time to them.

It seems to me that the biggest advantage to being a generalist is that as parents, we can identify what a kid is good at, and can start him down that road. Things go wrong when a parent is not himself enough of a generalist to figure out what the kid likes, and just pushes him toward something random or prestigious.

As for those that object to what you say, I wonder why they insist on putting words in your mouth. Perhaps they don't believe that a young kid could be interested in any deep topic without coercion; which relieves them of the responsibility to try to find what this topic could be. But my attitude is that as a parent, I may not find it, or maybe it's not there, but the potential upsides are large enough that I will keep thinking about it.