You DO realize why YiHi did that, don't you? It was to get around Evolv's patent on temperature limiting. The way it works is exactly the same as setting watts. If you set 30W on an Evolv and fire it for 1 second, you get 30J of energy. The Joules setting only happens in temperature limiting mode, not in standard wattage mode. And, for the record, YiHi are correct - Joules *IS* a more meaningful term when discussing heat energy, so they actually do win.
Same with their Joule counter - MUCH more meaningful than a "puff counter", which tells you nothing but how many times you hit the button. It doesn't tell you how many watts you were using, how much vapor was produced, how many seconds you fired the mod, nothing - useless gimmick (was sad to see ProVape go there). At least the Joule counter has real meaning.
I was laughing that they actually called it Variable Joule. I have made jokes about that term recently.