Email is almost always zero-access encryption (like live chats), considering the % of proton users and the amount of emails between them (or the even smaller % of PGP users). Drive is e2ee like chat history. Basically I see email : chats = drive : history.

Anyway, I agree it could be done better, but I don’t really see the big deal. Any user unable to understand this won’t get the difference between zero-access and e2e.