Today’s conventional wisdom is that both are spectrums. That means one person’s experience with autism isn’t another person’s experience with autism, and one person’s experience as a member of the LGBT can differ from another’s.
However, that’s what the whole point of the letters in the LGBT is. You could be a lesbian, asexual, aromantic, a lesbian who is aromantic, an asexual who is trans, and so on. Someone I know (who inspired me to ask this) has said they began to question why this isn’t done regarding people with autism due to constantly seeing multiple people fight over things people do due to their autism because the people in the conflict don’t understand each others’ experiences but continue to use the label “autism”.
One side would say “sorry, it’s an autism habit.”
“I have autism too, but you don’t see me doing that.”
“Maybe your autism isn’t my autism.”
“No, you’re just using it as a crutch.”
My friend responded to this by making a prototype for an autism equivalent to the LGBT system and says they no longer encourage the “umbrella term” in places like their servers because it has become a constant point of contention, with them maintaining their system is better even if it’s currently faulty in some way.
But what’s being asked is, why isn’t this how it’s done mainstream? Is there some kind of benefit to using the umbrella term “autism” that makes it superior/preferred to deconstructing it? Or has society just not thought too much about it?
The short answer is because autism is different from sexuality and the same system that works for one will not work for the other.
I would actually caution against embracing any label as part of your identity because as you have observed the autism experience is universally different. So too is the gay or lesbian or transgender experience. These are words we use to describe aspects of ourselves, but too often come to define us instead and enable exclusionary behavior such as gatekeeping identity or depening isolation for anyone who doesn’t fit neatly into a label.