I don't know what you're trying to get at. We can sit here and argue and say they should have done this and they should have done that, but that doesn't help anybody who wants support for them at this current moment.
And please don't exaggerate, non-GTK applications do work in GNOME. Qt5 has native CSDs that will show up in GNOME. If the application is a game or something that doesn't support CSD then the experience is somewhat degraded but they still work. You can resize and move any window by holding Super and Left/Middle clicking. I won't pretend the situation is ideal but I also don't believe it's totally unusable or on a bad trajectory at the moment—like I said the other libraries are working on getting CSD support too.
And please don't exaggerate, non-GTK applications do work in GNOME. Qt5 has native CSDs that will show up in GNOME. If the application is a game or something that doesn't support CSD then the experience is somewhat degraded but they still work. You can resize and move any window by holding Super and Left/Middle clicking. I won't pretend the situation is ideal but I also don't believe it's totally unusable or on a bad trajectory at the moment—like I said the other libraries are working on getting CSD support too.