A point you can make here that really upsets technologists is that organizations with real practical security concerns (for instance: most technology startups) can and do use the email infrastructure to have conversations that involve secrets --- but (1) almost none of them use encrypted email and (2) they rely heavily on GSuite for their security. And, for business-level secrets, this is usually fine! Better (more secure!) in fact, than the outcomes they'd get from trying to make the same workflow work with encrypted email! I feel like there is a kind of technologist whose head explodes when you tell them that links to GSuite documents are a safer workflow than PGP, but that is sometimes the case!
This, of course, goes out the window when your threat model is extrajudicial.
Agreed, although change GSuite to Outlook. E2E encrypted email would be considered a security risk at every company I know, and in fact would be illegal in a lot of sectors. They want to use IRM etc. for encryption and access management but also want complete control of the keys.
This, of course, goes out the window when your threat model is extrajudicial.