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In defense: Small because it only affects archer build orders in feudal. The bonus has little effect defending against goths or scout rushes, although is very good aganist archer civs.
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In aggression: An korean still has no significant eco bonus for an archer rush (wood discount is very little for archer’s little wood cost), so if they start attacking an enemy in feudal with archers means that the enemy didnt attack before…
In those cases it is a good bonus, but pretty niche. at least in feudal.
In team games, if korean mass archers they can have a big powerspike in castle age (upgrading archers with ballistics, thumbring, crossbows and free armor upgrade)