FSD cannot be solved at the individual vehicle level with brute force because the car cannot communicate with the server or the rest of the fleet in real time to decide what to do. It has to be able to decide what to do by itself and immediately, it doesn't have time to think about what to do either. The best chess master loses to the computer because the computer has all the sum total of computations it has ever done to reference. The car on the road doesn't have all data gathered by the whole fleet on board nor could it have a computer powerful enough to reference all that data in real time, nor can it rely on the computer which has done all the computations because that's on a server somewhere and the car isn't 100% guaranteed a connection, and especially not one with zero latency, to help it think about the road it's on right now.
Do we really know what data is sent to the car? It’s possible local caching could occur as well.