Saying to someone “I’m considered neurodivergent” makes more sense to me than saying “I might be on the Autism Spectrum, depending on who you ask.”
I think there's also a lot of liminal space inbetween different diagnoses where people might otherwise need to say "I might have ADHD or maybe I'm autistic, or maybe both, but it's hard to say" and "I'm neurodivergent" might be a frankly more useful way to describe the situation.
When you say RCS is a mess on Android, what do you mean? I personally have not had issues.