To me, this is clearly demonstrates of the excesses of the free-enterprise system. To compete the market, companies need to continue to improve even the simplest of products.
If one works then two is better. If two are fine then, obviously, doubling the number will vastly increase the performance, right? Let's be honest. Four blades are a bit of an overkill. Steering this implement around my face is a little like driving an SUV through a tiny, back alley. I think the replacement blades cost a fortune too.
In the end though, I do have to admit, when using four blades, my face does feel as soft as a baby's bottom.