IMO, as a 'high-functioning autist':

Yes.

The field of psychology is constantly redefining things based on ever shifting subjective analysis of behavioral patterns, and uh, being someone who very much prefers concrete, consistent, definable rules and categories, logically followable mechanistic processes...

Fucking yes, please, be more accurate and precise in a more objective way, based on far superior methodology, fucking please.

When they're understood well enough to have individual names, yes.

They do for many, but sometimes I think they don’t know exactly what or it could be multiple things which is why it’s the Autism Spectrum and it’s easier to say they are “on the spectrum” or “autistic” if you can’t pinpoint exactly what.

The DSM hasn't even been updated with the differences in how women present ASD.

Or we can take the process-based approach, where we stop caring about defining boxes perfectly and we start caring about patterns of thoughts and behaviors. This may sound woowoo or without empirical basis, but some of the most successful programs for verbal autism are based on these ideas, the AIM and PEAK programs.

We refer to a spectrum of diseases as cancer even though they have a variety of causes. Given that autism has been described as a spectrum of various behaviors, I wouldn't be surprised as variations of autism become understood.