There is no "turning on E2EE" with email.  It's SSL, like regular websites.  Unless you're saying using PGP, which most people are not doing and the metadata is cleartext.

When you say "there are simpler solutions out there", yes Mailu is open source email.  We are setting it up for people who do not want to read technical docs.  And setting up other services on the same VPS, so you get the most out of having one.

Your argument is unclear.  Are you suggesting people should NOT be self-sovereign and have a digital home?