Quickswitch or automatic switch to a different profile, i often found myself enabling an external display and disabling the built-in one, then when packing down my laptop i forgot to manually configure the built in, meaning when i got home i had a laptop with a blank screen,
Sometimes i was able to log in, open a terminal and enable the screen, other times i would have to reboot it. Something that could automatically enable the builtin if no external display is connected would've gone a long way for my usecase (my attempts at writing scripts for that never worked from what i recall, something got messed up when going to sleep)
Doesn't xfce use a dm? What kind of display configuration does it give? A gui for manually configuring the layout or something more?