A web browser?
Contacts app?
These are essentials for the phone.
What about an RSS client?
There seems to be an adaptive version of Geary now, which looks nice though I haven't used it yet.
> A web browser?
GNOME Web works pretty well in my experience, though it could be faster and it's still missing WebRTC support.
> Contacts app?
GNOME Contacts seems to work well enough on my Librem 5 - synced straight away with my Nextcloud instance, vs. on Android where I had to find a third-party app to do that.
I actually run mutt on Android already (yay termux), so should be fine.
> A web browser?
What's wrong with Firefox or chromium?
Many would need UI to be rewritten from scratch.
Person who advocates for Firefox on Android doesn't even know that it is already there.
Thunderbird
>A web browser?
Firefox/Chromium
>Contacts app?
kAddressBook
Edit: Maybe Google Maps, but that's it.