What does it take to be remembered?
At least originally, both the California Air Resources Board and the federal EPA wanted to be technology agnostic. For example, there was no reason to rule out the possibility of an ammonia-fueled internal combustion engine with catalytic converter that produced only H2O, N2, and warm air*. Or zinc fuel cells (unfortunately also referred to as zinc-air batteries).
* Because I'm an energy pessimist, there is a reason -- ICEs have poor thermal efficiency compared to power generating stations. In really round numbers, the electric transportation solutions have about a 2:1 advantage in efficiency due to 35% thermal efficiency versus 15%. I assert that we are within shouting distance of the time when we can't afford to throw away that 2:1 advantage.