verin0x

The main UI and GUI components are Qt. So you could use Qt bindings to build something with Rust. If you don't want the same look and feel, it's just a normal linux with wayland and systemd. Cross compile to the architecture and adapt the UI to the small displays and you should be fine.

In theory yes. Asteroidos has experimental support for a mainline watch. Most vendors don't upstream their drivers and kernel mods. Also Android drivers use an abstraction layer and a different format to some extentent. So you have to reverse and write your own driver.

So they could run mainline if the vendor or a user bothers to upstream drivers and hardware quirks.

A lot of the vendors don't meet quality expectations of the kernel team and sources are usually for older kernel versions and the code would need changes or refactoring.

Origin, Uplay and Battle.net are working fine. I play Battlefield 1 and Overwatch with friends on Linux. EGL works too, but I know nobody who is using it (except for the free giveaways and the engine).

It's on their own git server: https://cgit.kde.org/kdenlive.git/

When using the TOR Network, they take literally ages to finish.