- Whoever submitted the question very likely doesn't understand the question well enough to answer it themselves, so any feedback is not going to get a reasonable answer.

- The amount of time to check whether an answer is correct is non-zero. If you could somehow know that the answer was written by a human that ensures that the effort on the part of the answerer was non-trivial, and the "proof of work" infuses the answer with a minimum amount of trust which is absent in the case of a generated answer. Compare to a spam email: you wouldn't read all of the emails in your spam box thoroughly to determine if any of them contained a nugget of truth. You'd assume ill intent, and treat the contents accordingly.

These are extremely stringent conditions, though. Convincing-looking-but-wrong answers would arguably be even more damaging than a lack of answers.

(I suppose you could argue that these could arise from humans as well as from AGIs. I'm not sure if there's a good counter-argument to that)

And, lucky for us, that user has received the Informed badge for having completed the tour: https://stackoverflow.com/help/badges/2600/informed?userid=2...