I think some of the most important problems get hidden if there is a culture where you expected to also want a specific solution before you complain. People avoid reporting difficult, complex problems without obvious solutions. Maybe they just see somethings as "the way things are" at that org or that leadership doesn't want to hear their needs.

Better to have a free, easy ability to complain about things, and if there is a good manager hanging around somewhere, they can synthesize the complaints and discover if there are solutions possible at the org level, which individual contributors might not know about or even be functionally able to own.

I see raising issues in a postmortem or retro different from complaining, but I generally agree.