> Actually, I don’t know why a compositing window manager should enforce V-Sync anyway? Obviously you get screen tearing without it but the option should still be there for those who want it.
Every additional option (especially in the realm of video settings) opens the door for additional complexity, implementation error, and user error in unintentionally setting the undesired mode. It's perfectly understandable why window managers would settle on one or the other of two extremely different render-to-screen approaches, especially when general consensus for quite some time now in the graphics space has been that minimizing the potential for tearing is preferable.
Every additional option (especially in the realm of video settings) opens the door for additional complexity, implementation error, and user error in unintentionally setting the undesired mode. It's perfectly understandable why window managers would settle on one or the other of two extremely different render-to-screen approaches, especially when general consensus for quite some time now in the graphics space has been that minimizing the potential for tearing is preferable.