This is untrue. You cannot imagine a world where people, without changing the definition of people, don't need oxygen to breathe.

"they still do" is just begging the question. Plenty of people live without working. We're ruled by people who don't work.

You’re right that my reasoning was off. I don’t think it helps the point OP was trying to make. The argument being made in favor of labor isn’t “The only way for someone to be happy is to have a job” but instead “The majority of people will be unhappy without an occupation,” which is testable. The existence of people who are happy without any sort of structured, purposeful activity would not invalidate that the majority of people may well need structured, purposeful activity in order to feel fulfilled.

If you tested the claim it wouldn’t tell you about human nature, because it’s possible (and I think likely) that most people are simply conditioned to believe they need purposeful work to be fulfilled, so you could just as well argue that if society were to be radically re-engineered, it would be worthwhile to re-engineer it at the psychological level (such that no one felt the need to work), rather than the economic level (such that work was made available to everyone).

> We're ruled by people who don't work.

I don’t have any data to support this but I suspect the majority of those people that we would characterize as happy are still engaged in an occupation (not a “job” as such, but purposeful work that goes beyond mere leisure). I’ve seen dozens of well-to-do retired boomers who waste away on Twitter or YouTube and don’t seem to do much of anything anymore, which is what I’m guessing is the behavior you’re imagining when you talk about oligarchs not working, but I don’t see much evidence that the oligarchs are like that; most that I can think of have made no indication that they will ever retire. Now, granted, work looks a lot different if you’re Warren Buffett, but what we’re looking at is not the social benefit of work as such but the impact of structured, purposeful activity on an individual’s psychological sense of wellbeing. In that sense, I think it’s unlikely that these people would disprove the premise.