There is, as far as I know, no fundamental physical reason that prevents us from having high-efficiency electrolysis and high-efficiency fuel cells. As an exam

There is, as far as I know, no fundamental physical reason that prevents us from having high-efficiency electrolysis and high-efficiency fuel cells. As an example (I did not try to corrobate the report) here is a company that claims 95% for the former: https://newatlas.com/energy/hysata-efficient-hydrogen-electrolysis/ https://newatlas.com/energy/hysata-efficient-hydrogen-electr... So while it is true that current technology doesn't make hydrogen look like a viable option, improvements like we have seen in the field of lithium ans other batteries are probably possible and could change that outlook massively. If someone manages to produce 1kg of hydrogen for $1, that would, more or less, equal the current high spot price of natural gas ($9 for 1 million BTU, according to Wolfram alpha that's 293kwh).