This has the benefit - over direct connections - to be able to send a lot more data.
In particular fast moving frames may avoid fps drops with a higher target bitrate.
Solution:
1. Get file from sddm-greeter and startplasma-x11 (aka KDE) processes as well
2. Get users home dir from system instead of hard coded pattern /home/<user>
3. Prefer XAUTHORITY environment variable over Xorg -auth if available