Canada

What do I know? I've designed pressure vessels as a job.

Either you're the dumbest engineer in the field or you just made all that up. Seriously, your post is just a load of bull.

We already have an entire system for these types of tanks. They go from Type I to Type V: https://www.compositesworld.com/articles/composites-end-markets-pressure-vessels-2023

Much of the focus with hydrogen vehicles is using Type III or Type IV which have inner linings and don't have the problems with leakage or embrittlement. Eventually, the goal is the switch to all-composite Type V which don't need inner linings. And FYI, this is the same system used for CNG. So costs are in fact, very similar to each other.

The mining industry would pay BILLIONS.. scratch that.. TRILLIONS of dollars if hydrogen source was achievable, if they could reduce the need to vent their mines, if their equipment could output only water...

Funny because that's exactly what is happening. Billions are being spent right now:
https://pitchbook.com/news/articles/hydrogen-energy-transition-deals-record-pe-vc-2022
https://www.reuters.com/business/energy/japan-invest-107-bln-hydrogen-supply-over-15-years-2023-06-06/
https://rollcall.com/2023/04/20/hydrogen-energy-gets-ready-for-its-close-up-as-us-funds-flow/

Eventually, this will likely reach into the trillions of dollars: https://www.deloitte.com/global/en/about/press-room/new-deloitte-report-emerging-green-hydrogen-market.html

The rest of your post is either just pure Ludditism or ridiculous pro-battery fanboyism. It's objectively false. In fact, you're quite literally implying that the original story we're talking about is a work of fiction. You should be embarrassed to have written such nonsense.