It makes for good structure sometimes, don’t you think?
I find it fairly common that emails mix in questions and things to respond to throughout the email in order to sound, ya know, human and friendly. That’s at the cost to structure, so sometimes in a reply you have to force some structure so that it’s clear exactly what parts you are responding to. I find the
> character often enough for that as long as there is whitespace around it, but you could always apply bold or color or something to force a bit more structure.