It could if it really wanted to, but I doubt that's a very useful feature.
If you have concern over weird routine things, your best route would be to message that routine's owner. Hitboxes give me this depressing PTSD-like FPS game feeling, and I definitely wouldn't want them in WoW.
This is a feature in Gladiator Suite. It's called GSAero if you'd like to disable it you can in the options. It shows target, future CC target and who they are targetting. It's most useful in Arenas.