I went to go all in on Proton recently and found it cumbersome.
I’m not sure why I have .protonmail@protonmail doesn’t make sense to me and doesn’t look good.
They also don’t let you import calendars on the calendar app, import passwords on the password app. You’re basically working off a browser extension because you can’t do them on the webpage and they don’t have clients.
I was disappointed because it is something I wanted to use.