Many folks have attested to the fact that a DE can shave closer than a cartridge. I'm curious as to the reason behind this. Is it because it cuts at a closer angle because the razor has no pivot? In that case - wouldnt a non-pivot razor like a trac 2 cut just as close? Is it because blades are sharper? I can't see how just having one blade instead of multiple ones would lead to a closer shave.