I wanted to address these comments because I ran into something similar when I posted in this forum, I didn't know how to respond at the time, and it stayed with me.

Yes, for me it matters. I've been diagnosed at 52 years old. I have found work arounds for most things related to both ASD and other mental health issues, but these solutions caused their own problems. Going to a mental health practitioner who focused on the symptom of the problem rather than the problem itself, didn't help.

i.e. I am a runner. I've lived in forty states, and in some of those I've lived in twenty cities or more. I've also lived in about a dozen countries. I've had mental health practitioners try to solve that one, but without understanding the underlying reason, they didn't make much progress. (not ASD related)

But here's the thing: I became disabled five years ago. Most of my solutions and work arounds don't work any more because I'm not capable of doing them. So I'm running into problems that I can't fix for the first time in my life. Having a diagnosis prevents me, and my mental health team, from having to reinvent the wheel and we can start with those solutions that have had the most success with people with my particular diagnosis's.

They may not work for me, but it allows me to save time when I am struggling so that I don't have to struggle for as long.