"practical" is a relative word. If we run out of oil, as many here predict (not in many, many, hundreds of years, IMO) hydrogen becomes more "practical". Inefficient, certainly, but so is towing around a nuclear reactor.
The issue was the safety of hydrogen, not how "practical" it is.
Of course. If you want to sequester carbon...
If there is no NG... That was the discussion. Portable fuel is important but there are alternatives to gasoline but certainly not attractive.
It's going to take a *lot* of helium to run your car. ;-)