Except the quality hasn't been getting higher. Most of those projects wouldn't be considered HN worthy if a human being had made them, they only get the praise they do because they were generated by an LLM and as such they aren't projects so much as demonstrations of the latest model's capabilities.

Also the purpose of Show HN along with HN in general is to spark intellectual curiosity and create interesting conversation, and nothing about LLM generated code does that, because the person who prompted the AI to make it doesn't understand it and can't discuss it in any depth.