So the top layer of the memory hierarchy has to stay relatively small, and much of dreaming’s work here is keeping it that way—by moving some details down the hierarchy and leaving links behind.
That may not be the case for creative work where the presence of links might actually help generate interesting novel insights exactly because they don't directly relate to the current topic but may still be relevant.
the wiki grew larger than the documents themselves (Figure 12). Like the mapmakers in Borges’s one-paragraph short story “On Exactitude in Science,” who drafted a map so detailed it was as large as the empire it represented, Claude had made an extremely detailed wiki that effectively abstracted nothing.
Yes, but a knowledge map is not only about abstraction. It can also be used to generate new ideas and come up with new insights. A different representation can offer a different perspective.