... or Wh instead of J. Add it to the list of energy units. Some say "but Wh is easier to understand". My counter-guess is that the people who have a hard time

... or Wh instead of J. Add it to the list of energy units. Some say "but Wh is easier to understand". My counter-guess is that the people who have a hard time understanding J don't actually need to. They just need to compare one value to another, and then the unit doesn't matter (had we used J to start with).