Which vulnerability critically limited the effectiveness of medieval trebuchets during sieges targeting castle walls?

💡 Explanation

When targeting castle walls, trebuchets often suffered from inaccurate trajectory stemming from variations in projectile weight and windage, reducing their probability of a direct hit on structurally critical areas. Therefore, 'inaccurate projectile trajectory' was the limiting factor, rather than structural failure, shortened lifespan, or counter-artillery, which presented secondary problems.

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