The peep is checked by proper anchor.
Holy semantical GOD!
That's why a peep is not an anchor reference.The peep is checked by proper anchor. Proper anchor is not checked by the peep; therefore it cannot be an anchor reference. When you drop your bow arm, lower your head, or anything else that changes that"perfect angle form"you practice standing on the ground, your anchor point will change to compensate and "fit" the peep to the sight. So now you have a peep centered in your sight, but changed your anchor to achieve it. How can the peep be a anchor reference if it can cause this kind of error? Again, it's not a rear rifle sight. Bending at the waist from an elevated position keeps you from reinventing your form in a tree.
AGAIN....you're assuming the archer is placing too much emphasis on the peep being AN anchor reference and that he's foresaking all other anchor references to only get a clear sight window. I'm not saying he's doing that at all.....or advocating it.
Assuming all other anchor points are intact, though.....the peep is AN anchor reference. For you to say it isn't....you HAVE to assume he's compromising his other references. I dont' have to say that to claim it is.