Default Username

Android TVs that are able to be setup offline can be debloated with adb commands, no root necessary (though rooting can’t hurt, assuming the bootloader can be unlocked).

It’s very minimalistic and lightweight compared to QBitTorrent.

However, if you prefer extensibility or if you like the uTorrent UI, then QBitTorrent would be better.

Matrix has VC, but not sure about screen sharing.

I think Jitsi Meet can do screen sharing, but that’s a separate platform from Matrix dedicated to video calls, although I think Matrix clients can integrate with it IIRC.