AI assistance doesn't necessarily imply lower code quality. It can help with improving it in a lot of ways. Full vibe-coding without careful review is what results in low quality code. I think a lot of projects are having trouble getting to the sweet spot, though: if they allow LLM-assisted contributions then no matter how much they write to try make sure the result is high quality they're going to be inundated with far more low-quality contributions and have to work harder to filter through and reject them than if they just have a blanket ban which then makes it a lot easier to reject everything. The linked discussion is specifically with a view that not all LLM assisted contributions are bad but that they need to stem the flow for now and figure out how to open up afterwards.