Speaking personally, I have absolutely no need for variable wattage. I purchase all of my juice delivery devices with the same resistance (2.5 - 3.0 ohm) because I know that is the resistance range that performs best at the voltages that I use. I don't use low resistance atomizers at all. I prefer a cooler vape and low resistance gives me a harsh vape that I don't care for.
Variable wattage is useful for those people who have a variety of resistances to choose from. If that is you, then perhaps an APV that has variable wattage is a better choice for YOU. If that is the case, a Provari is not for you. Simple.
And even with VW,I still find myself moving the dial when I change juices or toppers. I don't vape to settings, instead to taste. For me, at least, there is truly zero difference between them. I'll take a good device, whichever it may be.