Just get a Pixel and flash GrapheneOS.

Your device is not your device. Google’s device, google’s rules!

You may want to look into CerberusApp - I know, it’s controversial and not FOSS, but it works great for me.

Really don’t get what all the fuss regarding Sync is about. There are plenty of alternatives out there, free or not. Maybe someone can explain what I’m missing?

Sure, I made the switch to Tutanota recently but I’m yet to transfer some events from the Proton calendar. Keeping it there until I do that :-)

And just like an ex, you want to stay away from it.

That sounds more like e2e2e!