I think this is a wrong take. Sure, opening preparation is important, especially in matches (like the World Championship), but once you're out of prep it's not

I think this is a wrong take. Sure, opening preparation is important, especially in matches (like the World Championship), but once you're out of prep it's not "just a memory game". Magnus is known for squeezing victories out of dead equal end game positions, not because of memory (they're all new positions) but because of intuition and accuracy.