Seem like a smart move. I don't watch Netflix on my cell phone and my iPad is wifi only, so about the only time this will apply is when traveling and not having access to wifi. That happens when Hotels charge extra for wifi, so I am happy to know that this option is there.
I'm in the same boat. Even though I have the Netflix app on my iPhone, I don't even use it. If I do, it's mainly to just add a movie or TV show to 'my list.' I usually save the video consumption portion for my iPad Mini 2, which is wifi only.
But knowing the option is there in the event I'm traveling, forget my iPad, and the hotel where I'm staying charges for wifi, I can still watch Netflix without having to worry about going over my allotted data.