Your points of contact with your face...hand to jawline, nose to string are ANCHOR POINTS.

Your peep sight is an ANCHOR REFERENCE and SIGHTING TOOL.
It can help to verify that your anchor is correct and that your sights are aligned. It is not considered an ANCHOR POINT because it does not ANCHOR or contact any point of your body and IMO also because it can be variable due to movement up or down within the string.

All anchor points are referencesbut all references are not anchor points. An anchor point must be something that cannot change under any circumstances, your hand to your face and where your string touches your nose for example. If you touch your earlobe, or back of your neck or whatever. Your string doesn't change and your hands , face neck and body don't change...........the things you ATTACH to the string CAN change. you don't rely on them as your anchor, you REFERENCE them to verify your anchor.

I do not consider a kisser button as an ANCHOR POINT even though it contacts your face because it can also MOVE, it is also an anchor referencesimply helping to verifythat your anchor is correct and your sight is aligned.

I hunted last year without a peep sight or kisser button......... just because I could.