In my experience, the problem with your thinking is that it doesn't play out that way.
If management is open to criticism and will actually use that feedback to make changes, you probably realize that fact and have already been giving candid feedback.
If they're not open to it, then your openness is just going to burn a bridge. It feels good, and you may not care in the moment, but at beat it's neutral. At worst it hurts you down the road.
I've experienced this indirectly, I was young and naive and figured it'd be best to be honest with why I left a prior startup I was working for, citing issue with my boss' management.
Turns out people in that startup knew my boss, didn't get the interview and was blacklisted from my prior boss even though we were on good terms.
If management is open to criticism and will actually use that feedback to make changes, you probably realize that fact and have already been giving candid feedback.
If they're not open to it, then your openness is just going to burn a bridge. It feels good, and you may not care in the moment, but at beat it's neutral. At worst it hurts you down the road.