It has far lower volumetric energy density so energy transport and storage are only as 3rd as efficient.
It tears apart pipes and meters through chemical reactions.
Fires are invisible, travel faster, and explosive mixtures occur over a much wider range of conditions.
Hydrogen is just a sucker trap for the technically illiterate to preserve the profits of the dirty dinosaur industries. It's a delaying tactic to keep us in the 19th century instead of the future.