- Because they have too much heating power and the vapor can get very hot, also influencing the taste, unless the wattage can be regulated to an appropriate level
and
- I had two incidents with DIY liquid(vg/water) and 0.8 ohm coils where the atomizer produced a hot watery steam and the flavor was off. It seemed as if the water was evaporated first, destroying the flavor on the way. This simply does not happen at a lower wattage.