Um. I think you're overthinking this.
First off: The battery charges faster when it's at its optimal temperature for charging. Which is warmer than its optimal temperature for driving around.
Second: No matter what the weather, if one is driving around, the temperature of the battery is being controlled. In the summer, it may be cooled. In the winter, it'll be warmed. Cooling is done through the coolant and refrigerant that hangs out by the superbottle up front; heating is done by at least three ways of which I'm aware: waste heat from the battery, heat from the heat pump, normal power dissipation in the motor, and forced power dissipation in the motor.
That last one, "forced power dissipation in the motor" has been around since day 1 on Teslas: the purposely run high current through the motor to heat the coolant.
When one shows up at a supercharger without the preconditioning, it just means that the battery's colder than its optimum charging temperature. If it's low enough, the car may not charge at all until the temperature is raised. If it's just low, the car won't charge very fast until it does warm up.
Having been chasing around the eastern half of the US since 2018, running into an SC with a pre-conditioned battery gets out out of there within a half hour; less, if it's a 250 kW charger. Waltzing into an SC with a cold battery (did this inadvertently in South Carolina one year) and it'll be 45 minutes to 80% when it's around 70F out; when it's cold out, longer.