Lifetime updates, no proprietary drivers, support of tens of different operating systems, schematics, openPGP card, desktop apps and convergence, verifiable security.
Those are features but not descriptions of good uses. Running a small laptop or steam deck fulfills all of that and much more and I've yet to see an instance where it's a good use. Again it sounds like a plaything to tinker with, with no real world use as a phone or computer.
> Running a small laptop or steam deck fulfills all of that
Why on earth do you need two separate devices (phone and laptop), when you can use one for both use cases (phone with convergence)? No synchronization or double-backups and maintenance required. Also, decreasing the amount of e-waste is a good thing as well as fighting with the user-restricting duopoly.
It looks like for you Linux itself is also just for tinkering, since you can already do everything with Windows and MacOS, isn't it?
Coming home, connecting my phone to keyboard and screen and continuing using it as a desktop. Using it as a thin client for any Linux server with the full access to desktop tools while on the go. Open your email/ssh session with authorization by the smart card, so that even if the phone is stolen or hacked, nobody else will have access to it. 100% defense against the corporate surveillance included in Android and iOS.
Can you name any good real world uses?