I saw this comment a while ago, and even now, I have no idea what point you are trying to make.

If you want to make a native GUI app work across desktop Linux users, it's not this simple

ok...and? The post was about making a native GUI app, which GNOME builder is clearly able to do. By your logic, the app in the video won't work across OSes.

My point is this is still clearly possible for native GUI apps.