Thanks for the clarification and good info about studless -v- performance. You're right, X-Ice (Xi3) is not a performance winter tire. At the time I first purchased for my RWD Model S, the tire was very highly rated including wet/dry braking. Interestingly, when I look at current reviews on the tire, it is not as highly rated as I recall it being and I researched options pretty extensively when I first purchased. Perhaps this is from the evolution/development of other technologies in the past several years that are now available? Nevertheless, I have been satisfied by 5 winters of driving on them compared to previously suffering through winters with the OEM all seasons. Looking forward to trying out my new CrossClimate SUVs this winter.
The CrossClimates look really promising as a year-rounder. I was interested in those, but ultimately couldn’t find them in an exactly matching size, so I went with dedicated winter setup (Michelin PA4s).