Godot's recent announcement spelled something out clearly: when a mid-tier rando contributes, you can provide feedback to that person and possibly help them grow into being a senior contributor or even a maintainer. That possibility of helping the human behind the code is part of the motivation for doing open-source. Mentoring shitty devs is itself giving back to the community, in a different form than the code itself is. And that is qualitatively different than giving feedback to an LLM.