True, that's an issue - maintaining the wrapper library and keeping featuring parity with native UI features is a cumbersome task and many do fall behind in tha

True, that's an issue - maintaining the wrapper library and keeping featuring parity with native UI features is a cumbersome task and many do fall behind in that. I think most wrapper libraries are still on GTK2, and perhaps working on GTK3. That said, wrapper libraries do help you make it much easier to develop for multiple platforms with one core code base. The final work of tweaking and customising for each OS, before distribution, is true even if you build the product with the native OS frameworks. (Some compromises will ofcourse have to be accepted.)