Because it's small and static and was designed to run in full screen / double buffered GL environments on any platform.
There will be GTK support coming but given it's alien method of gadget positioning and the current evolution of GTK2 (would prefer to wait for it to be stable and well documented) it didn't seem worth the hassle.
There will be GTK support coming but given it's alien method of gadget positioning and the current evolution of GTK2 (would prefer to wait for it to be stable and well documented) it didn't seem worth the hassle.