Here’s how SO could still be useful in the LLM era:

User asks a question, llm provides an immediate answer/reply on the forum. But real people can still jump in to the conversation to add additional insights and correct mistakes.

If you’re a user that asks a duplicate question, it’ll just direct you to the good conversation that already happened.

A symbiosis of immediate usually-good-enough llm answers PLUS human generated content that dives deeper and provides reassurances in correctness