You would think, but look back even a few pages in this thread. Users who tried to set their unit to 40W and complained of burning lips etc. Even in the one review Robert Ellis? Don't remember his name be complained about the preheat causing a hot burning vape in the beginning and wanting to turn it off. Again obviously he had his tp set high and his wattage set low.
I wouldn't use robert ellis as proof of anything, that guy is clearly clueless. Burning lips are not the result of preheat, they can't really be given that it works the way I said. Can you link the post you refer to a few pages back?