I don't quite see what it has to gain by reinventing the wheel, it's not like pulling in Qt/Gtk drains that many resources by themselves.
I have systems which have a GUI and yet have no Qt/GTK stuff whatsoever. The less code I can have on the system at all, the less chance that some of it will go wrong. But sometimes you really need a gui config tool of some kind for sanity's sake.
Of course, more and more of those are GTK or Qt apps now so I guess it's not really that important.