Agreed, there are quirks, and there is also an AI writer, though it never disturbed me and hope it never will.

But generally the UI is clean and they align with my values.

There is a bridge software that bridges Proton and imap so you can use any client. Never used it though, I find the apps pretty good. The latest generation is focussing on off-line use which will hopefully drive down down some of the latency, especially that of the calendar app is pretty bad atm.

My father somehow loves the search, but I myself am also unimpressed tbh. I do like the tagging system.

+ I'll add the obligatory complaint about the lack of Linux Protondrive client.