Did our first test drive of a Tesla Model S in December 2014 at Tesla Lawrence in Toronto Canada.
The first big snow of the year happened leading up to the drive.
The P85 had worn summer tires and handled poorly compared to my wife's Mercedes AWD SUV which had all season (3 season) tires.
I complained to the test drive rep, who was embarrassed, and promised to get winters put on the demo ASAP.
That was a highly negative experience, and my wife (who was the primary driver of our only large vehicle) stayed with her Mercedes almost solely due to this test drive. She refused to drive the demo after seeing how badly it handled with me driving it first.
When we bought our CPO Tesla S in 2015, Tesla fitted pure summer OEM Goodyear tires.
I made sure to get winter tires/rims, it was non-negotiable on my wife's part, that's for sure!
Only two summers later, our S85 handles poorly in wet weather on the Goodyear tires, and on last change-over Kal Tire noticed the poor wear on them, even though they have been rotated and only have 20000 km.
If Tesla provided a loaner with pure summer tires on it during the winter season, I would complain loudly.
We have no issues driving a RWD Tesla on winter tires, and I haven't decided for sure if I am getting dual motor on my Model 3, very likely, but not 100% sure.