If I try to actually educate someone or do my research fully, either someone will know more than me, and an expert will weigh in to invalidate some section of my posting- or people will pretend to be an expert- and you’ll spend a day trying to discuss why what they’re saying is incorrect. Both will cause the discussion for other people to die.
The best has been tangents that are tangentially related to the topic presented. There can be multiple of these subthreads and they always make for interesting reading.