Both accessibility, and application security are easier to build rules + improved models for because they have pretty solid constraints and outcomes. UX on the other hand is definitely more challenging given how much of it isn't quite codified into simple rules.

I didn't write off an entire field of research, but rather want to highlight that these aren't intractable problems for AI research, and that we can actually start codifying many of these things today using the skills framework to close up edges in the model training. It may not be 100% but it's not 0%.