I agree. No free lunch implies no general algorithm for solving random problems from the set of all problems. So what's the practical subset of problems that is useful in the real world? Fingers crossed, we already encoded the useful problems in the different game genres we developed. E.g. RTS pushes the planning vs. reaction dilemma, RPG tests verbal inference and morality, puzzles test logic etc. We already digitized a large claas of problems we care about for the real world in games!