I think the idea of text based only emails getting a seat on the table and even looking a good long term investment for Privacy!
Once we allowed email clients to act as de facto web browsers, loading remote content from servers when messages are viewed, we opened up not just a can of worms but an entire case of canned worms. Every privacy exploit for a web browser is now a privacy exploit for email. But it’s worse, because people naturally assume that email is completely private.
— Read on daringfireball.net/2019/07/superhuman_and_email_privacy