I got to say that I've never driven my 4banger on a slick surface -- snow, ice, rain, but especially deep snow -- in 4wd high or even 2wd with the Aussie I have in the front end. But even if I had Aussies in the front and back and was living in an area with good range of weather, something tells me that I'd probably learn to drive the jeep just fine on slick surfaces with inches of snow etc even in 4wd high. I'd air down the tires, drive a lot slower, try to weigh down the front and back more with winch, bumper tools etc.
Guys with Aussies or any autolocker front/rear would probably say even all that isn't really necessary.
Where I'd get a little concerned is if somebody else was driving it who wasn't accustomed to it though. There I could see things going youtube (girlfriend sliding in to a tree, hot-rod kid jumping a center median in to on-coming traffic, that kind of stuff)