I would have thought that, once you started moving, the battery would warm itself up and the full power would be available. Is that not the case?

I suppose that might not help if one's main use case is a lot of short, interspersed trips on very cold days. How long does it take for the battery to warm itself up?

yes, one of the weakest points of EVs in general. the new developments in thermals, namely the unification of the thermals and bridging of all thermal systems, stands to take a pretty big bite out of that. not to mention the heat pump. vacuum panels integrated into the pack could make it a non-issue, although i havent seen any talk of tesla doing that. for me, i would really like to be able to have a generator on board not only to extend range but also provide peace of mind for blizzards. the nice thing about that setup is that when the complicated machinery in the gas engine stops working, i can just take it off and put a new one on. or use it to power a jobsite. if the cybertruck would allow you to charge while moving, im not sure i could justify buying anything else for my personal situation.

Just curious, but what percentage (roughly) does your Tesla battery degrade with cold temps?

I tracked energy consumption (Wh/km) averaged over the time I had winter tires installed on my M3 (when temps hit 7 C or lower) and consumption was up by 20-25%.

How does it to in extreme heat?