I have had a RWD Tesla through 5 winters and driven through everything imaginable except for golf ball size hail. Those that tell you AWD is a must should just slow down. I have ordered the model 3 and really look forward to it. I have a 2013 MS for sale with 166,000 KM on it.
I have a lifted Tundra and a Subaru Outback (Besides the X). Couldn't make it out of my driveway with the AWD Subaru this winter - truck did OK for the last 4 months of winter here. Unusually deep snow, but still no way that RWD would ever be appropriate here. My friends/neighbours with front wheel drive just gave up and looked for rides to work, etc. Unless you had speed/momentum you weren't going anywhere. You do realize that while Toronto is in Canada, it is further south than Portland, and Ontario goes further south than the northern border of California?
The rest of us in Canada who live more than 50 miles from the US actually have winters!
There was still too much snow on the roads last week for autopilot to work.