The offerings over at https://protonmail.com/signup have been nagging me to give it a try.
I now have a reason to try and switch. I'll lose functionality found in fastmail but gain a lot in security.
As a corollary: if you really care, use Signal for stuff you can't say over e-mail. Whatsapp's fine too. But they solve a very different security problem than the one you need e-mail to solve, which is mostly "don't leak my emails" and also "don't reset my password for attackers who ask nicely".
Can you elaborate on this? What security problem are they trying to solve?
This makes discussions about email security confusing, because most security professionals I know are thinking about a very different threat model (pop all of your services) than what a lot of people think about (confidentiality). Google is pretty good at not letting random people auth to GSuite as you. (Still turn off SMS recovery, though.)
Does that answer your question?
So even though Google has a great track record of keeping hackers from taking over your accounts, the news stories about them cooperating with governments makes them seem less "secure" to some people.
What's weird is when it leads to a fallacy where people trust services that are less verified and tested in terms of security just because there isn't the association with government cooperation.
(I work on gmail, but I'm not intimately familiar with this option, other than knowing that it exists and is intended for high value targets like celebrities and politicians).