While "what is normal" is a reasonable question, a normal development is certainly closer to something that allows folks to achieve most things in any career/hobby/pursuit they choose.
Do you really see that as a "norm" being met by a majority of the population today? I don't think most people's lived experience is anything like that.
Normal being closer to what I said than what is usually achievable for folks with extra chromosomes? Yes, I do. I didn’t say it _was_ that anyone can achieve anything.