This is what I reckon.
DS has been diagnosed as autistic. I think now I probably would be. However, if he had been born in 1972 I don’t think he would, even if diagnosis had been as common then, because I coped fine with school and I think he would have coped fine with the education I had.
My primary school was very quiet, very chalk-and-talk in a cold, high ceilinged Victorian school building designed so the children would sit at their desks and not be distracted. Lessons were structured and there was always a right answer. I struggled at playtime but in lessons I could shine and was constantly praised. In contrast ds’s school was hot, noisy, varied, with a constant buzz of activity. You are never allowed to say yes that’s done, 10/10, there’s always something more to improve.
I was interested to read a book by an autistic former teacher whose own primary experience encompassed both sorts - he started off struggling in the modern one and luckily moved to an old fashioned one where everything improved.
I think what has been done to education, with the best of intentions, has been an absolute disaster for a large number of autistic kids who can’t cope so their behaviour deteriorates and they get assessed. Add to this the fact that life in general tends to be busier, noisier, lights brighter, with less downtime, more change, plus more emphasis on soft skills like communication which autistic people tend to struggle with, and people who might have coped ok in the past and found their niche find modern life harder to deal with.