What keeps you from using gtkd or dlangui

[Kapps via Digitalmars-d]

GTK is horrid on OSX, and I've had performance issues with it.
I was interested in dlangui, it has promise, but I don't really 
want to rely on a library designed by one person that reinvents 
everything. It's guaranteed that that one person will want to 
move on at some point, and I don't want writing a GUI program to 
include maintaining a GUI library.