Why can't I run Xwayland apps as root

When launching GUI-Apps made for X11 on wayland as root you may see an error like this:

Invalid MIT-MAGIC-COOKIE-1 key
java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable.

This is due to Wayland's security policy and design. According to Wayland, apps requiring root privileges should use Polkit to acquire those.

Since we know that Software always is perfectly written, there is a workaround for situations where apps simply need to be run as root:

#sets the permission to launch apps as root
xhost si:localuser:root
#launch the app with your user's environment 
sudo -E <app>

Removing the permissions after you're done is done by $ xhost -si:localuser:root.