Hello, and thanks for the video Eric! I have an observation that is somehow related to this. In late 2015 I swapped the front and rear wheels on my 2000 Citroën Xantia station wagon (FWD), because one of the front tires were out of balance, causing a steering wheel wobble. I also did it because the rear wheels had 5 mm of thread depth, while the front ones had about 1,5 mm.
However, this is where it gets interesting. The rear (now front) tires with 5 mm thread depth is old (from 2002) while the front (now rear) tires with 1,5 mm depth is from 2011. All of them are studless snow tires, two from michelin (2011) and two from pirelli (2002).
So, with my current configuration, using the oldest, but best threaded tires on the front, I feel that the handling is significantly better now than before. I should mention that I live in Norway, so the winters are fairly cold, with regular snow and ice. I should also add that I cannot afford new tires at the moment. If I could, I’ll just change all of them