In practice, dealing with PRs of potentially questionable quality is still a lot of work. You have to review the code, test the changes, make sure the docs are

In practice, dealing with PRs of potentially questionable quality is still a lot of work. You have to review the code, test the changes, make sure the docs are up to date, and explain to the contributor in the nicest possible way where they messed up. For some of my future projects, I'm even considering not accepting anything but docs and bugfix contributions at all due to the amount of work it takes.