You could say that about a lot of things that people spend a lot of time on. "Hard to cook when you're coding." "Hard to cook when you're playing soccer." "Hard to cook when you're decorating the school gym for the homecoming dance."

I'd actually argue that cooking while watching TV is pretty easy to do. I know plenty of people who do that. In fact, I'm about to head to a Super Bowl party where we'll be BBQing while watching the game.