I don't get it either. It's like those posts asking if people use separate razors for their face and their body. What real difference does it make? Are people really this disgusted of their own bodies? It ironically sounds like a hygiene problem.
i have a lot more body hair than facial hair, so its easier to keep them seperated to know when its time for a replacement without cutting my face up. if blades never wore out i wouldn't care hygiene wise
No because you don't need two blades for different types of hair anymore. You only need one blade now, meaning you have effectively reduced your blade consumption by 50%.