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Knock is from the shock waves caused by multiple flame fronts interacting, doing damage. You really do not want multiple ignition points.
While I'm thinking about it, years back Honda experimented with FRM cylinder liners, which had much greater hardness than typical cast iron liners. What they found in practice was that piston rings wore more quickly, and practically all of the engines with these liners began burning oil (and a lot of it) quite early. For whatever reason, they went back to cast iron liners and haven't deviated since.
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