I've only ever really consumed twitter secondhand like you, but I have observed that since the acquisition the quality of discussion in replies to tweets I am linked seems to have significantly dropped, and as objectively as one can opine about that kind of thing. Just angry graffiti and dumpster fire arguments about at-best-tangentially related culture war topics in reply to everything. I've made this comparison once already in this thread, but it reminds me of comments on youtube in the mid 00s.

But hey, youtube comments never improved much and that site is still highly relevant today, so hard to make a prediction based off my observed anecdote. And I've never used twitter much at all, so maybe I just hadn't noticed before.