I think this is the biggest reason. Qt is half a GUI toolkit, half an elaborate library for making programming in C++ more bearable. It even has a custom prepro

I think this is the biggest reason. Qt is half a GUI toolkit, half an elaborate library for making programming in C++ more bearable. It even has a custom preprocessor. Generating bindings for it is nearly impossible. C++ isn't the only game in town for desktop programming anymore. It's a shame because as a user, Qt is the most pleasant of all the toolkits.