There are some modern heat pumps which will work down to 15°F albeit inefficiently. The vast majority do not operate efficiently at temperatures under around 40°F. Most residents North of Florida or Arizona still use conventional heat sources to back up heat pumps. This may change in the coming years.
https://www.estesair.com/blog/at-what-temperature-does-a-heat-pump-quit-working-efficiently
I am not sure what your point is supposed to be. I imagine that you are just trying to save face. Manufacturers currently use heat pumps to warm up the cabins of some electric vehicles. That is because they are more efficient in temperatures above around 40°F. However, battery packs in cars like Teslas that have been left outside in subfreezing temperatures are still using resistance heating to get the batteries back to a temperature where they can take a charge.
Read my other posts, and read the links I provided, then get back to me.
Yeah, that is probably not going to happen... why don't you stop being so cryptic and just share whatever relevant information you have to share. Which manufacturers do you believe are currently using heat pumps to thaw out battery packs that have reached sub-freezing temperatures? Enlighten us please.
If you did, however, you'd find that I've already covered your points before you even raised them with others.