I posted a quick answer to a question a while ago. I wasn't super detailed and it certainly wasn't a model answer, but I provided a service to the community by being the only one to recommend a certain piece of useful software.
Original question: Fast mp4 to mp3 converter
Then just now, out of the blue, it was deleted with a comment saying that it "wasn't a good answer." Sure, it wasn't super detailed, but its actual content was good enough: it had two votes, second only to the top answer with three votes. This clearly shows I helped at least two people, but it's obviously safe to assume it helped many more than that. And my answer was just as long and just as detailed as this other answer yet it was not deleted.
I've used StackExchange on many of its sub-sites for a while and I know the customs. One of the main rules is that no content is deleted unless it is harmful (e.g. spam, a comment instead of an answer, or just entirely nonsensible and flat out useless). If someone deems an answer low quality, they are encouraged to leave a comment or to edit it with improvements. They can also simply downvote it if the answer isn't good enough for them.
So why are moderators going around necro-deleting random decent answers to random old questions? To me, this sounds like either a rogue moderator or that something really needs to be done to update the policy here with the customs of the rest of the StackExchange network, which is that nothing is deleted just for being below the standards for a high quality answer.
I have now edited my answer to provide more detail:
But since I never got a comment before it was forcibly deleted by a moderator, I'm unable to vote to reopen it with my new improvements. I would like it if the revised answer could be undeleted by a moderator, and I would also be interested if a discussion can be made about this topic as a whole.