But... stacking blocks... you know, with just letters or numbers or simple shapes on them?

That's been a very common thing kids do, with very common toys for like, 100 years.

Also, the entire point of toys, from a child development perspective, is to allow for the kid to develop their creative potential, to discover new conceptual and physical concepts.

The idea of 'an intended mode of play' is... kinda stupid, from an evaluation standpoint?

Unless you're testing specifically for 'ability to consistently follow instructions'?

That might have some use in diagnosing ADHD, but not Autism. They're different things, different behavior sets/spectra, and do not always present themselves at the same time: You can be just Autistic or just ADHD.

In fact, following directions extremely literally, dutifully, and consistently would potentially be an indicator of Autism, while also being a contraindicator for ADHD.

But anyway, from a child development standpoint, the whole point of toys is to discover how to have fun with them, to develop new mental and physical skills while doing so.

It really doesn't make any sense to associate simply stacking things with autism, unless maybe its taken to extreme levels of determination and effort to sort things into categories, sets of categories, or create genuienly complex, consistent patterns, or spend so much time at it that it shows signs of fixation, almost as if they're addicted to it.

I'm going with "neurotypicals broadly continue to not actually understand neurodivergence at all, because they literally can't think that way, so they continue to inaccurately attribute to neurodivergence overly simplified stereotypes".