I'll take this seriously since lots of people probably wonder this even if they don't bother to ask it. Disability isn't a permanent state that you start with.

I'll take this seriously since lots of people probably wonder this even if they don't bother to ask it. Disability isn't a permanent state that you start with. It's something that can happen to you 5 years into your career, or 15. It can also be temporary - you break your leg and now you need crutches, a cane or a wheelchair until you heal, for example. Accessibility also helps people who you wouldn't traditionally classify as disabled: Designing UI to be usable one-handed is obviously good for people who have one hand, but some people may be temporarily or situationally one-handed. Not just because they broke an arm and it's in the cast, but perhaps they have to hold a baby in one arm, or their other hand is holding a grocery bag, or they're lying in bed on their side. Closed captions in multimedia software or content are obviously helpful for the deaf, but people who are in a loud nightclub or on a loud construction site could also benefit from captions, even if their ears work fine. So, ultimately: Why should someone who's used to using a given editor have to switch any time their circumstances change? The developers of the editor could just put the effort in to begin with.