Oh those darn laws of physics! It has been mentioned that somehow in cold temps the battery is not charging to full or there is an impact to charging ability. That is simply not the case. Your battery is still charging to 21 kWh of capacity but in cold temps a greater percentage of that...
So beyond infrastructure changes what do you want GM to provide in the next gen EV? The engineers actually working on the car most likely have no influence over the larger infrastructure issue...
There is a clear description of what you are hearing on page 9-25 of the Owners Manual:
The braking system is computer controlled and blends the regenerative braking with the conventional hydraulic disc brakes to meet any requirements for deceleration. The controller interprets the braking...