When is this nonsensical tribalism going to end? Where are all the non-tribal people who are evaluating this stuff on facts and information alone? Why do we hear from the self-disqualifying tribalists?
Rant over. You're right - if we all buy cars with giant lithium batteries in then we need to buy fewer non-car lithium batteries.
And yes, pumped storage exists, and more will exist, but we have to decide how many point-solutions we need to replace consistent generation.
> Hydrogen/windgas - only about 50% efficient round trip
Moving electricity (at least in the UK) is only 90% [0] efficient on transmission alone. So, getting the power to the generation, which then becomes hydrogen at 50% capacity, to later burn at a certain efficiency and turn into electricity that gets transmitted at 90% efficiency, feels wrong. Unless your "round trip" figure includes the transmission losses, but then 50% feels too high to be doing that.
[0] https://www.statista.com/statistics/550583/electricity-losse...