We need to add something to this thread that has been overlooked and impacts a lot on everyone's theories.

The Feather str8 uses a disposable blade (a much heavier one) and it is machine made, but it is every bit as sharp as a str8 honed to perfection. Most barbers today will shave you with a Shavette or a Feather. Is there anyone here who can do better than a professional barber's shave?

The Feather works best with no pressure, just like a DE.

I've been using a DE for a long time and I can shave baby smooth with one. I'm pretty sure you couldn't tell the difference when I'm finished shaving. The difference is that the srt8 seems less irritating and it takes longer for the stubble to grow back, so it must be a closer shave.