The core issues with hydrogen:
o A really small molecule that is really good at leaking.
o steel embrittlement caused by hydrogen working its way into the metal.
o There are no hydrogen wells - you have to make electricity somehow to electrolyze water to get hydrogen. The only practical way to do this in large enough amounts to be interesting without using hydrocarbon fuels is with nuclear power plants.
Any approach that doesn’t deal with all this is a joke.
Ding!
Reality is a challenge these days.