The map is not small or something that fits in a 3 inch chimp brain("Rationality is Bounded"). And so we get Division of Labor and Specialization. The article notes it takes time to see connections which is directly connected to limits of the brain.
Secondly the problem Einstein is working on, say how to make a nice sandwich requires a search algo to run over the entire map to discover anything. Its easier to just teach or give Einstein a sandwich recipe.