No one has yet mentioned that the advantage in drawbore far greater than how it simplifies raising, is how an offset peg will do much to keep a joint tight as the timber seasons.
As the distance in the relationship of the tenon's shoulder to its peghole remains the same as the timber slowly dries, the same is not true of the cheek of the mortise to it's peghole, the distance between them does change - If the peg is not aligned to that future distance, (compensating for shrinkage) the joint will predictably shrink apart.
The Peg is a Spring not for pulling together an ill fitting joint, but for pulling joints tight as the frame seasons in.
Pegholes are for me and most of those I know and work with, the first in the string of operations when a stick hits the horses, yes before mortises are roughed.
