I think there are several different concepts floating around here. But, the two major categories in which they reside are: short-term visual memory and long-term visual memory.
What the OP has described is use of short-term memory. What you're shooting at is, as I read it, the use and development of long-term memory. Some would call this building up your "visual library."
As such, the OP is not doing anything other than relying on short-term memory to copy a drawing bit by bit. To which I would say, well, how does anybody copy a drawing WITHOUT using their short-term memory?
(I understand what you're saying about the pre-digested schema. But, my take is that Hogarth would have us believe that he's producing his work from memory in the same manner as Kim Jung Ji in the above video, with the pre-digested schema being more training wheels for students of his method.)