Actually, this is one of the biggest longevity-harming issues with the way Lemmy works: people ask a legitimate question, it gets a great answer, and the original poster deletes the entire submission once satisfied. Access to even the responses seems to be totally cut off versus (Old?) Reddit in which you can still view the discussions if you have a link to the post. At least that's how I've been understanding it. I mean, I saw a notice by a Lemmy mod in a Q&A tech community once (can't remember which, but I can try to look for it) asking people to not delete their posts once they get answers.

Someone elses idiocy can be your guide to wisdom.