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Humanoids should resist depending on their armor
I was thinking about this, between classes today. We could take a page from Dwarf Fortress' book (and real life) and have the material of the armor matter for more than just "how much AC does it give". For blunt damage it probably shouldn't matter, but an additional modifier of
Ah = hardness of armor material
Aw = hardness of weapon material
n = some weighting factor for how strong this effect should be
matFac = (Ah/Aw)^n
damage = damage * matFac
might be applied to (say) slashing damage vs chain mail, slashing/piercing damage vs plate armor.
This might add an additional consideration for deciding which weapon to use: a high-hardness, low-mass sword might deal less listed damage than a lower-hardness, higher-mass sword, but it would actually end up being more effective against chain and plate armor.