There’s no doubt there are better diagnosis. I was at a highly selective private girls school and there were a lot of girls who were clearly autistic. We called them the weirdos and weren’t actually very nice to them. They were incredibly brilliant academically but struggled socially. Most went on to Oxbridge and are very high up in science classics or classical music.
other friends at school absolutely had ADHD. I think we knew they were different, smart as can be but all over the place, a bit naughty but never labelled as weird
It is a bit of a double edged sword. My DD who is 18 was quirky and shy. When I raised if she was autistic I was laughed at and it was never mentioned as a possibility. Clearly she is autistic and her childhood would have been much easier even 15 years ago if it were recognised
On the other hand I do wonder about over diagnosis which may feed into people “growing out of it” I am fairly sure that when my eldest was small, if someone had suggested to me he might be autistic I would have gone for a diagnosis.
He had many traits which at age 1-5 could absolutely have suggested autism. Terrible sleep, separation anxiety, stimming, limited diet, extreme obsessions, meltdowns along with being super bright and no concentration and unable to sit. He had to have incredibly strict boundaries, naps only in his cot, strict routine
however by the time he was about 7 he had matured massively and by about 8 had no issues whatsoever and is a completely neurotypical 22 year old. I am not saying for a moment he was autistic, he absolutely wasn’t but I do worry that if I had him as a baby today I would have looked for a diagnosis as parenting him was so unbelievably difficult and he was so different to all the other babies and toddlers