What does HackerNews think of Akira?
Native Linux App for UI and UX Design built in Vala and GTK
Also, Glade is not really even used by GNOME designers that much, what they do is make mockups in some other tool (usually Inkscape) and then have the developers implement it. I don't know about other GTK based desktops, though I think some Elementary developers are working on this: https://github.com/akiraux/Akira
I want a Visual Studio level IDE that I can develop Linux GUI application in. GTK is an amazing piece of software, and there are some beyond amazing GTK based applications that I found and started using.
As someone who has not done linux GUI development before, the biggest issue is getting started. Android has first class development support, and so does iOS. Linux has Glade for GTK and QtCreator for QT apps.
Vala is an amazing first step, and the code makes design & development super easy. But there is still a disconnect between design and development that hinders adoption. If there was a nice "all in one" application where development can be done like. You could see the hype, and then disappointment, when https://github.com/akiraux/Akira was announced and it looked like such an IDE. But alas.
The Rust GTK Bindings also look really good, but I think the biggest hurdle that needs to be overcome is making Glade either more user friendly and making it tie into an IDE like Builder, or have an IDE like IntelliJ support it.