I think it's worse than that. At least if I dumped 5k LoC on somebody in 2021, you knew I spent the time to write it, so it's "fair" to ask you to read it. But I didn't write it in 2026, so you shouldn't read it.
I think it's less about "break it down" and more about "let's communicate at the same altitude."
I wrote a (bait-titled) post about it: https://tern.sh/blog/stop-reading-prs/