Since you posted this, I assume you'll like watching this video of the popular Youtube Channel "Gamer Maker's Toolkit," whose creator is a big evangelist for accessibility... While I don't think every game has to have these features, I do think they should add them if they can.

The only accessibility feature that I still haven't decided if it's okay to add for every game is the difficulty. My current view: "I think some games should stay insanely difficult, even if it led to fewer people playing them."