Yes, they show you non-EV tires, but as you said, the load rating is different because the vehicle is different, the rubber is harder etc etc. look up the difference before stating something you know nothing about.
240V @ 80A for a single circuit is the problem - 100A is the house breaker in many rural places. 200A is an average home and you haven't electrified everything. I have a fully electrified double home with now 400A worth of service and I don't have enough, especially not in winter when the heat pump doesn't work.
The Model 3 is a small sedan for $50k, I am driving an SUV or family sedan for half that price. A lot of people's electric panels are not in the garage, mine is literally on the other side of the house. Most people electrical panel's are central to their home, whereas garages are on the edges or more often around here, detached. Garages attached to home are more expensive for builders (there are extra code requirements) and electrical panels are centrally located for the exact same reason, cost.