I used ProtonMail for a few years, but ended up switching to FastMail. Too much became too difficult due to the full E2EE, especially the calendar app was impossible to use together with other apps or even other people.
The email app was _fine_, but not great, and again E2EE was difficult to use with other apps. Especially on desktop I like using a dedicated app, and their bridge just never cut it for me in terms of stability.
The VPN worked well! I ended up switching to Mullvad, and have now moved to Mullvad-over-Tailscale, which works alright.
I never used their password manager (very happy 1Password user), their cloud storage (content with my Syncthing setup).
Same here. I gave up on Protonmail, even after getting my family to switch to it. Ultimately the lack of good email searching was a dealbreaker. Fastmail has been great, especially with a custom domain and masked emails (the 1Password integration that auto creates them is great when it works).
Seems that Protonmail has made some improvements for the searching but people are still complaining. Oddly enough I'm also using Mullvad but I couldn't be bothered to get it via Tailscale as I share my subscription with my dad.
Thanks for the feedback! Regarding desktop, we now do have dedicated apps for Windows and macOS, and the Linux one in beta: https://proton.me/mail/download.
The email app was _fine_, but not great, and again E2EE was difficult to use with other apps. Especially on desktop I like using a dedicated app, and their bridge just never cut it for me in terms of stability.
The VPN worked well! I ended up switching to Mullvad, and have now moved to Mullvad-over-Tailscale, which works alright.
I never used their password manager (very happy 1Password user), their cloud storage (content with my Syncthing setup).