A mod for Honda EU generator owners

I could be wrong (and often am), but I don't think that turning the built-in switch to off would accomplish the same thing as the petcock valve in the video -- the "off" switch kills the spark but does not drain the carburetor. The petcock valve cuts off the fuel, allowing the carb to run dry. And unless you use the generator often, draining the carb is a good way to avoid a clogged carb -- here in California, the ethanol gas will foul the carb unless it is drained.

But my question still stands -- there must be an advantage to the petcock valve over manually draining the carb by opening the float bowl screw, but I just don't see the advantage?? Maybe it's that if the "run dry" method does an adequate job of draining the bowl so that the carb does not foul, turning the valve is easier and neater than my old-fashioned method of just draining the gas.