There's a saying something like "people don't leave bad jobs, they leave bad bosses" that can be extrapolated a bit. Work can be very positive and rewarding, or it can be negative and abusive. Everyone's experience is different; sometimes I feel that the fact r/antiwork has attained such saliency is maybe a sign that there's too much of the latter experience and not enough of the former.

I disagree with this, at least as a blanket statement. Plenty of workplaces are a deeply negative factor in people's lives.

If what you're saying is really more along the lines of "having a project and way to spend the time is a net positive", then I completely agree, but I don't think that has to be tightly coupled to work (as in employment) per se.