"its all true, but you forget hydrogen is an existing Industry with 100 billion kgs of hydrogen produced every year. Much of this is transported and stored far from the place of production."
Except that your statement is totally false, which a few minutes of researching on the internet would have proved.
The fact is that the overwhelming majority of global hydrogen consumption (at least ~95% of it) occurs in the ammonia (i.e., fertilizer) and oil refinery industries. And just about all ammonia factories and oil refineries operate on-sitehydrogen manufacturing plants, meaning very short hydrogen production-to-use transit times, involving a mere few tens of metres of piping and related equipment. And not just any old piping and equipment either. Very specialised (and expensive) gear.
The only tiny amount of hydrogen that gets translocated to any meaningful degree (and most of that is done via stainless steel road tankers) is for specialised, high-tech applications such as electronics and aerospace where the cost of hydrogen, including the expensive transport costs, is proportionally insignificant. But those are clearly bespoke and unique situations which are very different to the notion of widescale commercial and retail use of hydrogen, as is contemplated by those wishfully trying to flying the hydrogen kite in terms of commercial mass usage.
Conceptually, hydrogen is great.
It is energy dense, environmentally friendly [*] and easy to produce.
Hydrogen is nothing new or novel; we've known how to manufacture hydrogen for over 200 years, and the first hydrogen airships were commissioned in around the 1850s.
But making the stuff is 5% of the job; 95% of the problem is handling the gas at even remotely modest scale.
If it was feasible to go mainstream with hydrogen, that would have happened years ago.
But taking the industry to large scale is impossible without blowing the budget.
As is evidenced in the past few months with volleys of announcements about hydrogen projects getting cancelled.
[*] Make that perceivedto be environmentally friendly, because it leaks a lot. And when it does leak it is acutely diffusive meaning it very rapidly finds its way into all parts of the atmosphere. And there it preferentially bonds with OH hydroxyls, which otherwise serve as sinks for methane; methane being a very powerful greenhouse gas (20-year and 100-year GWP, respectively, 80 and 30 times higher than carbon dioxide).
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