There are many apps which are very sad when you use the F-Droid version vs the Play store version. Namely push notifications, or in some cases, mere existence. Element.io app for a while there (at least when it was riot.im) was using polling to check for new messages instead of push notifications. Because no google means no google cloud messaging (or firebase, or whatever it is now).

Home Assistant is great and open source, but they refuse to publish to F-Droid over a name dispute from years ago (someone had an unofficial app and had refused to relinquish the name and F-Droid let the unofficial app keep it). Which means if you want the home assistant app to control your lights... Play store.

However. My ubports pinephone which is running Arch is missing a few key features. Performance is one. And I can't get the replacement mainboard that has the extra RAM because it's been out of stock for the past few months. And the other is Wi-Fi calling. I live in an area with poor reception and need wifi calling.I just flashed my android phone back from LineageOS because lineage wifi calling wasnt working.

I really really really want pinephones and librem 5s to work out. I acknowledge it is hard "lord's work" they are doing. but it's still not quite there yet. We're getting close enough that within a few years, I'll be using linux as my daily driver, even if I don't feel comfortable recommending it to my grandma.