"become heated when, in reality, we mostly agree with each other. "
True.

Back to topic.
Colors themes for colorblind / partially color blind +1. It still falls under UI. You can have many themes made, if UI is done right.
Poor eyesight - also I think is solvable with a "theme". Everything bigger / bolder text / more pronounced buttons. Maybe even different levels.
I don't know how JAWS scripts work, so I have no comment.

About other DAW "features". I guess my position is this. If they make it the right way, that will work in harmony with everything else. Seamlessly switching tasks, tools, etc. Does it really matter? If it will break things or make it more challenging of getting from point A > B than it's another story. Just give it a though.

Cerio said everything 10x better than I would. Main problem with BIAB is discovering features and unfinished items. That is why I've mentioned that graphics, UI design has to be weighted on holistically together with features it will represent.