It will still be hard to keep the tiny molecule from leaking out at the fitting in the fuel system. And you’ve still got to make the stuff, there aren’t any hydrogen wells. I haven’t seen anyone ramping up nuclear plant construction.
Hydrogen is plentiful just needs to be split from water, just need a method by which such a splitting becomes economically feasible, with more energy produced compared to the energy required to split it.
Leaking is one of the reasons Toyota gave up on the idea I read somewhere.