I say this as someone who actually ran mailservers for about 25 years, who can telnet to port 25 and type SMTP to send an email, and who is hugely found of plaintext: I'd rather quit coding than move to that workflow. I loathe every bit of the pipeline of getting a clean patch from machine A to machine B, where I control at most one of them, and having it come out the other side with the same SHA256 digest. I don't look down on people who prefer it: to each their own! But I'll never in a million years understand it. Say what you will about the GitHub-style PR process, and there's plenty to say about it!, but there's a reason that devs outside LKML and the *BSD mailing lists pretty much immediately leapt onto GitHub the moment it became widely known. It was a revelation.