[z1mm32m4n]

I'm not sure I necessarily agree. Inbox by Google (and before that Mailbox to some extent) has drastically improved my email workflow. Being able to "snooze" emails and get a notification about them when you're likely to be able to take action on them was a novel idea that moved the email space forward.

I refuse to believe that we've exhausted the list of designs we can try to continue to improve email. And considering how pervasive email is, even marginal improvements can have profound effects.