Getting credit when a bug is fixed, test pre-releases, feedback buttons inside the app: this feels like much better places to invest instead of trying to save the PR as social ritual. I had a few own projects, and it was really not easy to get people contributing. But getting good feedback to make the project better was much more easy.
So maybe we need a less technical way for engaging with the community. Where the authors are right, I think, is succession. A person who write great issues still don't know the code good enough to take over if the maintainer leaves. People can engage with issues and feedback, but maintainability don't work like that. And I haven't seen a good answer yet how the next maintainer should learn the system if they never had reason to read it.
Maybe we need a way to give the users a better way to give feedback to the project and make their feedback showable in the project. This is also important for many people.