@RandomMess
Who knows it may be that the overall population is more like 60:40 NT:ND the more education and society moved towards better suiting NT the more ND people struggle.
I think you're right about this. Also in general that society and expectations of the individual have become more difficult for neurodiverse people to navigate over the years, so more people are not coping and looking for/finding the explanation as to why. I would include children and the school and home environment in this.
Fyi I'm a late-diagnosed autistic woman. However, looking at the Broader Autism Phenotype (ie. family members of autistic people often show some traits even if not meeting full diagnostic criteria) it's obvious that my own family members show traits. And I wonder if various events and circumstances in my life had been different if I'd ever have ended up being diagnosed at all. I think I may actually be in the BAP group myself but life has highlighted the autistic bits.
Autism seems to be very poorly understood. Also, the more we know the less we realise we know! Then there's the links between autism, ADHD, dyslexia, dyspraxia, etc. I think humanity has a patchwork of traits and some, at the more extreme end and grouped together are called "autism" (or ADHD or whatever). But this means there's a lot of people who may struggle with just one element, or who wouldn't struggle but it depends on their environment. And the line between being autistic or not is actually much vaguer in terms of traits/personality/thinking styles than the clear-cut diagnostic line.
What would be interesting to know is whether those with more severe autism (for want of a better way of putting it) have also increased in number, of if its just the somewhat-functional people like me. People like me would be grand if everyone was the same - the world would be different! But some people have autism to such a degree that that wouldn't work. If this level of severe autism is becoming more common too, there might be something in the environment that is affecting gene expression. I feel like the scientists will already be all over this, to the neglect of looking at the social context, though. That seems to be how it goes in general...