@height8 I could, but I sent him a PDF once and he asked if I could send it in Word, totally unaware that PDFs support annotations as well.
Given that Word is the one format I try to avoid even as an intermediate…
I just don't get how academics like him — he's not even that old, he's in his late 30s or early 40s from what I've deduced from our conversations, and he only defended his PhD in 2011 — can have such workflows.