Huh? Can't print this email? Let me forward to my non-secure other address.

Huh, message is going to expire? Better make a screenshot that syncs who knows where.

If they were serious, they'd create a mode that mirrors Protonmail, where they can't even read your stuff. And make it easy to use PGP.

As suggested below/above, the fact that our company Office365 Android env stops me from copy pasting text to other apps does one thing: It makes me forward certain mails to my home address.