Don't forget many in your second paragraph have a lockable centre diff Peter, giving you the same as the part time 4WD in your first paragraph when in 4WD.
Good point Graham. I had overlooked that.
For those that have Facebook there is a video of a Jaguar F-Pace on the ski run at Bormeo. I have seen another video of an SE AWD with winter tyres doing the same thing on the same day.
https://www.facebook.com/gruppoclericiautoJaguarLandRover/videos/1241536825900903/If you don't have an account you can still watch the video if you click on "Not now" or whatever it is in the pop-up. this reduces the size of the pop-up and then by clicking on the video you can select full screen mode.