[rnk]

Why not add a gas engine too, for places where you only have gas and not electricity or hydrogen? Because it's unnecessary weight to carry around. Toyota and Japan pushed hydrogen for a long time because their industrial base is so focused on gas/diesel drive trains. Their vast investments and expertise will be worthless as we leave it behind. They've also never made any progress getting away from hydrogen coming from fossil fuels. h is not a great fuel source because it's so much less dense than carbon fuels, you can't get far on one tank. It has two benefits, easy to refuel, and burning it doesn't produce pollution, but the negative of coming from fossil fuels kills it.