Hard disagree. Something like that being a
consistent outcome is unrealistic. Even the very early longbows, the most powerful bows of the early medieval period, had difficulty doing something like that.
Don't get confused by videos showing tests of Renaissance-era Mary Rose longbows that had poundages of up to 180. Early medieval longbows probably went up to 80-90 pounds or even less.
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11th century longbows, the best available, with well-made arrows could
probably penetrate single-linked mail and
probably get through the padding underneath deep enough to injure, sure. And even if it didn't penetrate, it would hurt. But it would require multiple shots to either weaken the links or get the lucky hit that goes right through, which is the sort of thing you represent either with massive RNG (20% chance of penetration for 100 damage), which doesn't work well with Bannerlord; or with incremental damage (20 damage per shot, 5 shots adds up to 100 damage). Not a straight up one hit kill.
And we could debate the realism all month (I think I've seen you do so in armor threads before) but that would miss the important part.
It isn't fun, or balanced, or good for the game's tactics, or for game design in general for armor to be that weak. (Leaving aside that it makes headshots pointless too).
When a "single heavy war arrow" (presumably fired by a T5 archer) can take down a "man in mail" who has no shield (this describes multiple troops, including the
T5 Vlandian Pikeman and Vlandian Voulgier) in "one shot" from a "50-0 metre gap" (which is about half a football field), and is capable of firing accurately about six or seven times in the time it takes the melee units to cross the gap...
Then with such unrealistically ineffective armor,
a T5 archer can slaughter seven melee fighters of the same tier without even getting scratched. 7:1 kill ratio for a unit of the same cost.
As being oneshot
would effectively give T5 mailed units the same defense as T1 armorless units, here's an old video with pre-nerf Fians to demonstrate what that would look like. Just imagine the Peasants are T5 Vlandian Pikemen.
That's just stupid.
Mail needs to become better across the board, even against the best archers with the best bows.
Post-nerf Fians twoshotting mailed enemies is bad enough, if they could oneshot that would be even worse.