The free supercharging is also likely to change what conditions you might want to supercharge in. As a refresh model 3 LR owner on a long run, a supercharge happens in the middle of (or more likely towards the end of) a long drive after a 100% charge is severely dwindling, typically after driving at motorway speed for 4 hours. Even if the waste heat from the motor isn't huge, it can build up over time and provide battery heating for the cost of running a coolant pump.Yeh my experience (in this particular car with no heat pump, etc.) has been that in the middle of winter, there is F-all squared heat that comes from the motors (relative to what is needed to raise battery temps from near freezing to 30C+) and pre-conditioning on the way just otherwise eats into the already limited winter range.
Preconditioning may be more sensible for the wider good of the 'fleet', shall we say, especially newer cars with heat pumps that are more efficient at recovering heat, and from the point of view of collectively better charging time, vehicle throughput/efficiency at the SC's but from a personal perspective (on this car) it otherwise just eats range and is needlessly spending on electrons. The penalty is charging time, but as this increases with age anyhow isn't vitally important.
With free SC, you're more likely to want to charge on shorter trips.