You can make a suggestion here.

Proton’s implementation isn’t like a time capsule, it’s meant for just scheduling emails to others, not yourself. Scheduled emails are available in their own folder, and can be edited or deleted.

I’ve used Proton for a few years now. I’m very happy with the service and will continue to use them going forward.

Proton VPN is in my experience fast, I’ve never experienced any drops in connection. It’s fine for sailing the seas, and they have dedicated servers for Tor, P2P, support for split tunneling, as well as their “Secure core” which routes your traffic through an additional location for extra security. They also offer “NetShield” for ad and malware blocking through the VPN.

Proton Drive is also great for my use. It’s not as polished as Google Drive and Google Photos, but functionality wise it’s good imo. The photo backup feature is pretty new, so there’s no fancy features there yet - it just backs up your photos. The main thing I miss from G Photos is the timeline UI on the web interface for quickly scrolling to a day/month/year. Their document editing feature is also relatively new and kind of bare bones compared to the offerings of Google and Microsoft, but personally I don’t use it a ton so for my use case it’s fine. Sharing files and folders through Proton Drive is also great, since you can password protect your share links and set an expiration date. Really useful for when you just need to share something with someone temporarily or whatever, it’s nice to not have to go back in to revoke access.

Proton Mail is, you guessed it, also great. The UI in both the web interface and the Android app is nice and intuitive, like you said. They’ve actually improved it quite a bit since I switched to Proton. No complaints there. Big plus for supporting custom domains and hide-my-email aliases through Proton Pass.

I’ve also made the switch from Bitwarden to Proton Pass, the main reason for switching for me was the aforementioned aliases. They acquired SimpleLogin a while back, which was a service I was already looking into, so when Proton introduced it through Pass the switch was pretty obvious for me. They mostly have feature parity with Bitwarden. The only thing I miss is the ability to fill passwords from the Firefox extension window, instead of from the input field you’re filling out.

Proton Calendar: it’s fine, it’s a calendar. No bells and whistles really, but once again it works for me.

Proton Wallet: haven’t used it so can’t comment on it.

Ah I guess I didn’t think of that use case, it being the Proton app. I think I read somewhere it’s possible with the Windows client, through their Bridge software. I haven’t had the need to use the Proton client for other email accounts personally.

Mobile mail client? Why not use the Proton Mail app?