I shoot split, and nose to feather is one of my anchor points. Was sort of accidental for me... I started noticing that when my eye/arrow alignment and sight picture were good, my nose happened to touch the arrow.
I don't even know, or particularly care what point on the feather-I don't think it's necessarily just touching the back end, and I don't mess with moving the feather around to find out.
I'm recently finding it can work (for me) cock feather in, or cock feather out... and I'm not gonna think much about that, but shoot whichever works.
Like folks are saying, and usually do... we've all got different structures and styles. I think maybe my nose is on the longer side, I deliberately shoot with a high anchor, so it's an easy one for me. And it's one reference, not the whole show.