The problem is PRs that have <5 lines of changes followed by dozens of pointless merges, because users are prompted to merge every time another PR is merged. I

The problem is PRs that have <5 lines of changes followed by dozens of pointless merges, because users are prompted to merge every time another PR is merged. It wouldn't be a problem if people took the time to organize the history prior to merging as you said, but most people don't do this.