There is debate within the autism community about ditching the catch-all term "autism", but I don't expect it to go anywhere. Broad labels like that are useful. I can tell a random person that I'm autistic and they generally understand that my "abnormal" behavior is innocuous. It's less useful to give a stranger a 30 minute lecture on my individual needs and challenges.
Read up on the controversy around asperger's and the "high/low functioning" dichotomy. These were standard measures for a long time and have only been dropped in the last ten years or so.
But more widely, there's a bunch of conditions of varying severity that might be caused by being in a car crash. That doesn't make "I was in a car crash" a bad answer to "what happened to your leg/eye/speech", it's just a fact.
Isn't this true for just about any condition? It's not like people with ADHD or depression all behave exactly the same. I understand the urge to avoid categorizing people too broadly, but at the same time making the "taxonomy" of a condition hyperspecific is contradictory to having the label in the first place.
If saying "I have autism" has no descriptive power because this could mean a million different things, it seems like the term needs to be retired or narrowed to a specific set of behaviors/challenges.