Look at autism today vs even 10 years ago, look at how many perfectly adjusted individuals are diagnosed with it something just doesn't seem right to me.
When I've started school we have had 2 kids with ADHD during my entire primary school class, by the end of high school half the class had some sort of form of learning disability which many of them got to get extra time on tests or other type of exemptions (verbal testing for example). I've seen this happen in front of me within a decade and it seems to happen now again with other so called disorder. Don't get me wrong I have the utmost respect to children with developmental disorders I've volunteered with a special care group for 2 summers during high school and I've seen what the ends of both the disfunctioning and functioning spectrum looked like then and the very clear similarities you could tie between them in many activities.
But now? not really I've met some people that were diagnosed with Autism late in their life mostly with AAS (usually after a fairly short diagnosis session) all of them are to me perfectly functional adults yes each and everyone of them had their issues but I've seen in none of them the actual "signs" that I've seen in actual children that were professionally and clinically diagnosed with what back then was while quite polar but fairly narrow spectrum.