I have a VW/VV and I never have it set to wattage. I hate having to go through the menu, switch it to voltage, and then fine tune my vape using VOLTAGE to suit my liking.
You are using it wrong then. What purpose is there to change it back to VV just to adjust the voltage? Why not just adjust the wattage? The voltage will automatically adjust accordingly. For all practical purposes, you're targetting a certain wattage (coil temperature) anyway.
I have never just set the wattage and assumed "Well, this is the watts I usually vape at or around, no need to fine tune. It couldn't possibly get better than this!" Heck, I even change the voltage on the same juice in the same atty depending on how it tastes to me that particular day. Sure VW will get you to the ballpark, but it can't find your seats for you.
If watts can't get you there, then neither can volts. Changing one causes the other to change. It's just physics. Changing wattage is just more convenient and makes more sense because it's a direct correlation to coil temperature. Voltage, on the other hand, requires taking resistance into account and some math (or a chart or a smartphone app). For vaping purposes, watts is always at least as good at volts. In most cases, it's better because it's simpler and easier. No charts, no apps, and no math required.
The bottom line is, if you can do it with volts, you can do it better/easier with watts.
I'm not saying wattage is the be all, end all. But it is the best technology available today. If someone makes a "Variable Temperature" device, that would be even better than Variable Wattage. But even that wouldn't the be-all, end-all. Maybe it's adjustable coil surface or vaporizing rate? Or even Variable Vapor and Variable Throat Hit. The point is, higher level abstractions are convenient and easy. Microcontrollers or microprocessors are better at arithmetics than humans.