"Just fire discs" well that's easier said than done, and there's probably a tons of reasons nobody uses discs. One of them is already that we have no experience building or using disc-shaped bullets, especially compared to the trove of experience for... bullet-shaped bullets. So that's not a solution as much as it's an indication that this defense mechanism wouldn't be perfect given an adversary with enough time and will. That being said, nothing is ever perfect, and "arms race" are named this way for this exact reason.
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