Hello,
as an experiment, I tried to remove the "xfce4-desktop" bundle from one test system in order to fully switch to that Gnome based "desktop", however it seems that the "os-utils-gui" bundle still depends on the "xfce4-desktop" at the moment (see also: https://github.com/clearlinux/clr-bundles/blob/master/bundles/os-utils-gui - note that it also lists 2 XFCE apps there: xfce4-screenshooter, xfce4-terminal).

Is it just something that You forgot to replace, or has the transition of this package to Gnome not been done yet?