Sometimes I do white balance. It depends on the light. For example, I've tried white balancing during dusk, but when I do, the color is all green. So I figure maybe dusk is best left at a daylight balance maybe, unless I am doing it wrong.
And there are a couple of scenes I have in mind I want to do for a short, where I want more than one color of light hitting the actor's faces. So I can only white balance one of the lights, but then the other might not be as color correctable, depending on the light color temperatures. And at night, I don't white balance under orange sodium lights, cause faces look too desaturated and I can't bring the skin tones back well enough. So I just set those lights to around a tungsten white balance.
So I white balance if it will work the particular light of the particular scene. What's that go to do with contrast or color tone?
That's a good video. It's interesting how he talks about how adding a green tint is good for lips. I've had a problem with lips being too pink if I add saturation in post, and I don't even add much, just a little, but the lips go super pink. If that's what he's talking about.