> why is there not an option to turn off "black out other monitors when going full-screen on a movie"?

Here was my train of thought on reading that:

Who voluntarily uses iTunes?

Who voluntarily uses iTunes on Windows?

Can you watch movies in iTunes on Windows?

Why would you ever want to do that?

Blacking out other monitors on full-screen? That's a pretty novel idea, I've never seen that before. Apple would never implement such a cool feature on a competing platform.