I don't think this is very surprising. This is not the first winter for many EV manufacturers, or owners. And of course EVs are pretty popular far into the arctic circle. E.g. there are super chargers in Northern Norway, people use them throughout the year, and it seems fine there.
I think at this point there are very few surprises for manufacturers and they are pretty well aware how their vehicles perform under different conditions.
I'd be interested to know in how those shiny new F 150s are holding up providing power to people who are in areas with power outages. It seems that these are exactly the type of conditions that justify owning such a vehicle. Presumably, Ford did a lot of testing in cold conditions to make sure they work fine there.