Unrelated since this only affects package hardened-desktop-environment-essential-xfce.
(Since we nowadays have non-qubes-whonix-gateway-cli and non-qubes-whonix-workstation-cli it is nowadays a lot easier to add support for other desktop environments compares to times where Whonix KDE was the only thing that existed.)
See reason for each individual package above. Overall reasons:
- don’t install things which are a potential source of bugs (such as session management, remember this bug where KDE session saving caused this: kdesudo error popup window ( sdwdate-gui ))
- avoid unnecessary things (such as power savings inside VM)
- less potential privacy issues (sessions savings)
- lower attack surface
- save disk space
- not have some unnecessary, potentially harmful package included when upgrading to the next major Debian version