A small example of accessibility benefitting everyone and not just folks targeted by accomodations is:
8ish years ago I decided my online handle was more my real name than my legal one (which has attachments to my family that I don't like) and started using it everywhere. I kinda expected people to think it was silly or be confused by it. And some were.
But it turns out a lot of people and systems were already coping with name changes related to trans people, and in a lot of cases (my two most recent jobs, several online services, some doctors and therapists) there already were accomodations I could use to register a "preferred name" that was different from my legal name.
It's hardly universally accommodated, and of course there are many reasons besides a gender transition that folks change their names already, but man was it a nice side effect.