@ekuber
This is a real conundrum.
Surely much of the problem (and solution?) comes from the fact that so many of the things that are necessary for truly excellent usability and accessibility (design expertise, user testing, iterative design, triage, product mgmt chops, assembling a team w/diverse perspectives, managing & resolving the healthy tensions that creates, etc) feel like the very things OSS developers are often trying to escape: process burden, painful compromise, deferring to others.