IMO the quality of discussion here is about the same on reddit. Which is to say, not very good, or very deep. It’s shallow observations, memes, and one liner gut reactions to headlines. People have been conditioned over the past decade to not engage with long replies or complex thoughts. It might have to do with social media becoming more or less defined by people engaging with it on mobile devices, which don’t really enable that sort of engagement. But it might also be people genuinely not giving a shit anymore and only wanting that minor degree of superficial interaction.