All I'm saying is, when talking about efficiency the electricity source should be considered as well. Besides that efficiency is not the right metric to ask for

All I'm saying is, when talking about efficiency the electricity source should be considered as well. Besides that efficiency is not the right metric to ask for here. Environmental impact is the important metric. Destroying existing infrastructure, destroying vast ecosystems in Chile to mine Lithium, enslaving Africans to mine Cobalt, use lots of energy to purify silicon for solar cells, building a more distributed power grid, installing charging stations everywhere. All of this has environmental impact. If you can make synthetic fuel with solar power in some desert (Nevada is big enough), you can keep all the old stuff and still be able to save the planet.