Comment by blindm

Baking in automatic crypto to email is a lost cause, since email is not as straight-forward as let's say Signal, which only succeeds because it exists in a monoculture (iOS/Android). Email operates on 100s of different clients (and operating systems), and you get people replying-to-all by mistake, and fat-fingering sensitive data to random recipients (which is possible in Signal, but not nearly as bad as e-mail where e-mail can exist in any hostile environment it wants, unlike Signal which has a user which is more careful about what he/she sends).