I've asked to at least include Gnome Shells fixes on Gala and Cinnamon as well by default(note, I don't use Cinnamon, only test now and then). If that gets some response, I'll go on with more things to report, but I don't see much that traction in non game bugs.
I mentioned KWin to show you one(of many) example where developers have to treat Catalyst as a special case. Compiz also does that a LOT. Don't you think something is wrong with that?
In "no hacks mode" I can't even take proper screenshots(they might show the background, they might show an application that was previously open, weird stuff). Is that a window manager problem too? Again Catalyst specific.
Certainly everyone is broken and Catalyst follows everything to the letter, but most applications are apparently also developed in a broken way. Do you think that's how it is?
I am not an opensource driver fanatic, but at least the open drivers seem to (mostly) work without bugs when a spec is implemented. At least they are implemented properly I mean and no application specific hacks are used. Certainly I can't say quite the same for nvidia. But can you claim that such a different behavior just by renaming an executable file is not rational from a properly working driver. Past experiments have shown certain OpenGL extensions to be available or not depending on the name of application(let's say compiz). I haven't tested much on that now(not enough knowledge on my part), but I hope it's not as bad as it used to. Because having GLX_EXT_texture_from_pixmap or whatever(I don't completely recall the name of the extension) only when you're named compiz(probably a few other names as well) is pretty wrong from my point of view at least. (And racist, lol)
Btw, that's a bugfix update for Shell/libmutter, still it should be backported, but who am I who know whatever genius versioning system they'd use.
May I suggest an experiment. Copy "gnome-shell" executable to a file with another name. Run "/path/to/new-name --replace". See how well it runs on Catalyst now that application specific bug was fixed. You can try it with other wm's too. Maybe it runs fine, maybe not, who knows.