I hesitate to make blanket statements, since this is quickly evolving, but in general I agree. LLM generated docs will quickly degrade to overly verbose, unreadable crap.
I don't think I've ever seen an agent review a doc and then NOT also go look at the code. So skip the middleman, just have the agent look at the code.
They are truly horrible at generating docs, prompts, knowledge bases, memories, etc.