Apart from the fact the round-trip efficiency is abysmal, hydrogen is so small and lightweight, it leaks through everywhere unless you have some specialized (read, expensive) equipment. I'd say why not if we could just repurpose gas infrastructure for it but turns out, no. I know people like to accuse each other's favorite energy sources of being fossil industry shills but hydrogen truly look like an attempt at stalling by big fossil. Hydrogen sounds good to politicians who don't understand energy, only understand fuel and just want a new clean fuel.