Absolutely agreed. I've often found myself seeing that someone has misunderstood something, and wanting to write "if the source of your misunderstanding is (a) then [several paragraphs] whereas if it's (b) then [several different paragraphs]. Asking them whether it's (a) or (b) by email adds another cycle and often isn't understood anyway. It's just far more effective to communicate synchronously (face to face or by phone).