I agree with your assessment that the quality of threads has probably decreased, and I fully realize I am part of the problem. However, I think part of the isue is that there just aren't any RPGs worth discussing that I've played recently. I didn't like Underrail or DivOS, so I don't tend to go into their threads to tell them their game is shit. I didn't care for AoD. I couldn't be arsed to complete any of the Shadowrun games. Numenera was terrible. Wasteland 2 was worse. The only RPGs I have an interest in have already been discussed to death. The ones I'm mildly curious about still have 0 info out.I'm saying that we got hit by a huge wave of idiots and edgy retards following GamerGate and DU doubled down on the "you can't touch them, they can shitpost everywhere!" policy, even as they were hurting some great RPG debate.Are you stating that DU only started this policy 3-4 years ago?
Bee helped make this the best forum on the Internet about RPGs, but DU made it clear it's more important for him to be the "free speech" forum. So the quality of threads greatly decreased, shitposting and edgy politics increased and a lot of people who actually wanted to debate RPGs left or stopped posting here, creating discord channels and the likes - even before Bee left.
Another part of this problem is the shift in the way people communicate with each other that has affected the quality of discussion. But you could probably write 5 books on that.