Charge decay may be real, but it’s mostly irrelevant. It’s about on par with leaving gasoline in a car long enough to start congealing. So long as you use the thing reasonably often, self-discharge is trivial. I’ve left an EV sitting for weeks, no meaningful power loss.
EVs might be useful for short commutes and grocery shopping trips and the like in compact urban areas with moderate climate, but are total non-starters for the long distances in the mountain west states with extreme winters and extreme summers. EVs are not general purpose vehicles due to limited on board energy capacity.