It isnt that weird. Just look at the gemini-cli repo. Its a gong show. The issue is that LLMs can be wrong sometimes sure but more that all the existing SDL were never meant to iterate this quickly.

If the system (code base in this case) is changing rapidly it increases the probability that any given change will interact poorly with any other given change. No single person in those code bases can have a working understanding of them because they change so quickly. Thus when someone LGTM the PR was the LLM generated they likely do not have a great understanding of the impact it is going to have.