Maybe I am wrong, but I think proton doesn’t encrypt headers and some metadata, Tuta encrypts everything or almost everything. Also, proton mail is not available in F-Droid
Personally, I don’t like proto, it doesn’t follow the separation of powers principle, what happens if proton suddenly changes their policy? That is why true free and open software tend to be decentralized, for example mastodon vs bluesky, the only way I can really trust you it is if you can’t “betray” me, even if you really want
I care about privacy, but you just lose a lot of features like “Find my device”, security check-ins, now playing, live transcriptions, etc… If you care too much about privacy, okey, but it’s not a “basic thing”