You're free to not use and not install it.
I use compiz on Fedora and CentOS with the Mate desktop. I don't do it for wobbly windows. I do it because it allows me to set up my desktop to work the way I want it to, and it increases the smoothness and perception of speed. Other compositing window managers like Gnome 3 just don't work the way I do. I like being able to customize compiz completely to my liking. I like my hot corners to do certain things, such as show all desktops, and show all windows. The compiz desktop expo viewer is just super slick and better than anything I've seen yet. You won't find any wobbly windows or gratuitous effects here. Everything I have on is to make my desktop work well and smoothly.
I don't see how blender is relevant. Just because renders everything in its window with OpenGL doesn't mean it has anything to do with being a composite manager using the output from other apps and windows.
Now with indirect rendering as a normal X11 extension, Enlightenment is a compositing window manager, like compiz or gnome 3's wm. And the future is, they tell me, with wayland, where these things will continue to exist as compositing managers.