Think about Atmosphere: A-C type worlds with Fluid Oceans that are not composed of H2O, but from other molecular substances.
Well, I guess much will depend on what are those fluid oceans made of. Hydrogen may be taken from other soruces than water, for what I know...
And, in any case, I guess in those not-friendly worlds most people live in domes, and personal transport is less needed than mass transport, where pure electrical means are less an issue, so I mostly think on friendly ones, where people roams free on the atmosphere with personal (utilitarian) means.
Hydrogen is NOT quick to refuel. It's also ridiculously expensive (in the real world).
Take your usual petroleum fuel price and multiply it by 6-10x (or more!) and that's the typical hydrogen refueling station price.
But, as you say yourlef above in the post, with ample and cheap power and better superdense materials for storage, this will no longer be the case.
Yes
You no longer need to make an overnight stay in Zaragoza at a (low power) destination charger before completing your road trip between Barcelona and Madrid. Simply plan for a 30 minutes (or less) charging session at the Supercharger station (get out of the vehicle, stretch your legs, use the water closet, get a drink, etc.) before resuming your journey. So ... 6-8 hours in an electric vehicle too.
Well, you can really have a good lunch in Zaragoza, as food is good there
...
Nonetheless, unless this has also improved, those quick charges burn the batteries quite faster than slow ones, and they are the most expensive part of your car...
Fuel Cells have their niche roles, including Air Independent Propulsion (AIP) in non-nuclear power submarines(!) while submerged ... but they aren't a panacea and they aren't "best in slot" for every single use case where you need power. However, those use cases tend to be in "challenging environments" (such as in space or submerged in the ocean) rather than in terrestrial vehicles (cars, busses, trains, etc.).
Well, I see it the opposite way: once those problems are solved, fuel cells are the default for small power plants (car, motorcycle, small to medium planes, etc.) in friendly planets, while batteries are the alternative when they may have problems (including non-friendly plantets, though they will use colosed environments and so less such personal transport). Both have issues, but I see easier to solve and probably cheaper...
By the way, may I ask you a favor? Try to avoid using so many acronyms, as they make reading it slower for those of us not used to them (not to tell if English is not your native language, as it's my case).
