The hydrogen path is less energy efficient than the battery path, so it’s only useful if you have really cheap electricity.

If the batteries themselves were to remain expensive even as the electricity to charge them/electrolyse water became cheap, I can imagine a scenario where the lifetime cost difference between batteries and hydrogen tanks might be more than the cost of the energy wasted as heat by making the hydrogen. I don’t think this will happen now.

The same dynamic on a slightly smaller scale means I can also believe that hydrogen cars could be a Vimes’ Boot: low purchase cost, high running cost, so poor people have them because they can’t afford the cheaper option.