> In contrast the question Gerber used about a "meaningful contribution to the world" [...] It's a very heavily loaded way to put the question.
You're right that Graeber's question is vague (it could do with improvement/narrowing) but the first question quoted above isn't so much worse but just completely irrelevant. They've asked an entirely different question unrelated to what Graeber was trying to get at.
If I don't "have the feeling of doing useful work", does that mean my job is not useful, or my job is potentially useful but carried out inefficiently. Am I attempting useful work but blocked from doing so by some administrative or practical barrier? Do I consider myself insufficiently talented or qualified at my job to carry it out in a useful manner.
Graeber's question, while in need of improvement, is at least asking about the right things: the jobs themselves. This new question is asking about the people's individual relationships to their jobs, not the actual purpose of the role.