Firstly there's a 3rd type: someone asks for help and you post a suggested solution 3 years later. Extremely useful for all the lurkers who also had the same question and are reading looking for possible solutions.
But secondly, even your own counterexample I don't think checks out. If I'm browsing your forum & interested in perspectives on working at Lyft v Uber, I absolutely want to read a recent update and contrast that with what people thought 3 yrs ago v now.
Tbh, the "I got my sound card working" post seems least appropriate of them all (but still ok to do imo, necroposts are good)