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In the "smaller vehicles" part, great obstacles need to be overcome.

I would be content with doing only the parts that are reasonably economical and efficient:

• produce it, store it as a compressed gas
• if CO2 is available, convert it to methane (can be liquefied for distribution) or even bigger molecules
• if there is demand, use it to reduce steel
• if storage maxed (no CO2, no ore to reduce) burn it back to water in a turbine, selling electrical power when the market needs it

Economically, this would likely make ends meet - and keep hydrogen away from consumers (consumers are careless and their systems often faulty, while hydrogen is demanding and dangerous).

Yes, using hydrogen cells as one part of the storage for over production of electricity from renewables would be the way to go, if you go hydrogen.

Hydrogen in gas form regularly escape atmosphere and there's no long term study about what will happen if we mass produce it Hydrogen gas cannot be safely stored, the container will get metal fatigue unless reforged regularly Hydrogen gas is so small that it can pass through almost everything

Yeah. Adoption means nothing as one is making hydrogen with the mindset they make petroleum based fuel.
Production needs to come before adoption. And by that, I mean, the end goal production process.
Any adoption before that is just wasting more energy.

But that's the same for batteries, from what I see.