For me, this is the opposite situation. I like long texts that detail other aspects in a topic, the writer’s intent, references, lists, etc. that make discussion matter more and hit its core aim rather than having a limited space where you can only vent your emotions in a few words or just simply talk about something in a limited, headline-esque urgency.
I think the character limit was increased a bit over the years but the short text culture persisted, even if some people try to use chain comments as a way of posting long discussion texts. The platform simply goads people into that style, which is antithetical to meaningful discussion.