

A lot of people see an upvote as a signal that they endorse the message, or at least want it to spread.
A downvote is the opposite of that.
You’ll never convince people not to “shoot the messenger” on link aggregators because it’s antithetical to their view of the system.
That sounds like pretty much exactly what we did at my last job, and it worked pretty well IMO. The individual commits in a PR didn’t ever matter. I don’t even think we used them for code review, except if it came up for review a second time after rework. In that case, we were able to just look at the new commit to see if the right changes were made.
And we definitely avoided basing off each other’s branches. We had to do it a few times. The only times it went well was when the intent was to merge the child branch into the feature branch. If they were actually separate tickets (and the second relied on the first) it was generally chaotic. But sometimes, it was just necessary.