All FOSS consumer operating systems suck. We only tolerate them because they are FOSS.

I desperately want to use it, but it runs on precisely no decent hardware as far as I can tell. My attempts to get it working on the fxtec and furiphones failed miserably.

Agreed. Linux is the future, fk Android. GrapheneOS should stop wasting their efforts on Android, when they could've contributed towards PostmarketOS or similar, or even made their own distro. Working on Android is a complete and utter waste of time and effort.