This is a big topic in disability rights activism; there are a lot of people who can do some work some of the time, with a certain level of accommodation, and would benefit from so doing.

But that's not how the system works. It forces everyone into binary categorizations, with the aim of removing help if at all possible. So it becomes economically necessary for people to present themselves as helpless and stay away from work or even volunteering, because doing so jeopardizes their means of surviving the bureaucracy.