I dunno, not a huge fan of TL;DR (even though it definitely has its place for long-winded walls of text) -- I feel like TL;DR is a cause or a symptom or both of our dwindling attention spans. I think this inability to read anything longer than a tweet, and the resulting loss of nuance, has been pretty bad for discourse, online or off.
AI-writing is definitely very annoying to read, but I don't know if it's ideal to start dismissing interesting content before we even get to its substance just because we don't like its form.
but our dwindling attention spans are caused by a deluge of material sapping our energy before we can devote it to something worthwhile. developing a fast and frugal mental filter for insubstantial walls of slop is a new prerequisite for not being so exhausted that you default to saying tl;dr to the real, good stuff.