>like for example when you post something serious (not even controversial, it can be something as simple as a question) but don't get a lot of serious replies because "OLD INTERNET NOBODY TOOK ANYTHING SERIOUSLY LULZZ"
It really depends on the thread, which users are around at the time, and the overall mood of the board in that moment - there's been a ton of informative threads, serious discussions, lengthy advice, etc. in Heyuri's time, even on /b/ of all places. It's mainly the overly gloomy and self-oriented "me me me let's talk about me" posts that are routinely trivialized and derailed, but even then that's not always the case

It's worth mentioning that Rule 1 on Heyuri is "In mature threads, be mature, in retarded threads, be retarded! and yes, you can tell the difference." which was stolen from old 4chan XD. If an OP feels like their "mature" thread will not be taken seriously, they can manually invoke that rule by mentioning it, and it will be more heavily enforced for that thread than it usually would