This is a point that needs to driven home.

Yes, filling up gasoline delivers energy at an insanely high rate due to its density but the vast majority of that is wasted and not converted to miles driven.

The real comparison is miles of range delivered per minute of fueling. And a Tesla supercharger is already competitive with gasoline by this metric. If hydrogen takes longer than gas to fill up a tank for a similar range then its already behind just charging directly.