When I help people in forums or social media, I don't do it for future people. I do it for the person I am responding to. If someone else gets something out of it, that's great, but I didn't aim it at them.

And so I don't care if it disappears the next day. I just need that one person to get what they need.

Worrying about the future in that situation is just going to add friction and make me more likely to not answer at all. Not everything has to be optimized to death. Sometimes it's okay to just do the easy thing.