Okay...this is beginning to make sense. So why would my Vamo give me the opportunity to adjust wattage? Why not just provide the ability to adjust voltage since wattage will be automatically changed?
With voltage you would need to adjust your voltage to your desired vaping level every time you change that atomizer/clearomizer/cartomizer. In other words depending on the resistance of your juice delivery device you will have to manually change voltage with VV.
With variable wattage you can leave the wattage alone and the vamo will adjust the voltage to give you your desired wattage no matter what juice delivery device you screw on it.
So for example I like using Variable wattage. Lets say with my 1.9 ohm clearo I like to vape at 7 watts. then I switch to a 2.4 ohm device. With VW I do not have to fiddle with it the vamo will adjust itself to give me the 7 watts I like taking into account the change in ohm.
Some people like fiddling with it and prefer VV some people prefer set it and forget it and would rater use VW.