I also get GTK2 for free. That's not the problem. I'd happily make my own GTK3 theme if GTK3 weren't so incredibly hostile to theme development. It's literally less reliable than Windows Blinds, which is a frickin' hack on top of a closed OS.

It's not a problem of asshole theme creators, it's a software quality problem, and everyone in the Gnome Project's bubble is dancing around it and pretending it's good for the users.