I just made the switch to proton in the last week and so far I’m happy with it, even decided to pay for a year of service. The one feature I’m surprised to see missing from the android app is conversation view. The web app has it, but mobile doesn’t. My personal email is very minimal so I don’t really care, but for heavy users this might be an issue.
I’m on Android. If you search for this issue, they’ve been talking about adding conversation view for years. It’s currently a non issue for me, just pointing it out for anyone considering the switch