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Hydrogen combustion doesn't produce co2, optimize a petrol-fueled ICE all you want and it's still a problem WRT emissions.

I think the assumption is that hydrogen fuel would be produced via "green" electricity sources like wind/solar/nuclear.

There is that subtle issue of how do you get hydrogen.... Takes energy to make it.

You can just break apart water with very small tiny little hammers.

Finding the miniature dwarfs to do this is the tricky part.

gotta feed them though so still energy needed

Takes energy to mine+process the contents for and charge batteries too.

Batteries have 1000+ cycle life time (LFP batteries even more) and charging is very efficient. Not at all comparable.