Add to that the problem of “boil off” / “pressure venting”. There are some cars that empty their hydrogen tanks on their own in about 2 weeks. Just because of this issue.

There are new ways to store hydrogen, but these also need external (=from a separate battery) electricity to release it again and the process is slow and doesn’t provide enough amperage, so it can only be used to slowly charge another big battery that is required for these cars to be able to drive.