Good points and I think you are right - it is the same with LIB’s (lithium ion batteries) in that weight is a big problem.
I am not a proponent of the tech one way or another outside of my belief that hydrogen as a “transportation fuel” would benefit from nuclear power.
I am a BIG proponent of nuclear power and our Navy demonstrates quite well that it can be viable and safe at scale for power generation.
It is interesting that Toyota is committing a lot of resources into hydrogen vehicles as part of their “all of the above” approach (a much better business model).
So am I, with 38 years as an employee and consultant in the industry.
It is a safe and reliable supplier of electricity.