[Polydamas]

Its probably also worth pointing out that there is very little evidence for how the resistance of low-tech armour varies with weight. About the only model I have seen is Alan Williams' formula for the performance of iron plate armour against bullets as its thickness varies, and that formula is definitely a 'rule of thumb' rather than the result of a broad scientific consensus. There is almost no evidence for how the penetrating ability of hand-held weapons scales. And we have a physics professor who thinks that the GURPS penetration model is more wrong than it needs to be. I lack the skills to evaluate his argument.

So proving that any alternative to the GURPS model of damage and wounding were more accurate than the old model would not be easy.

Edit: Or from another perspective, reworking the model to fit firearms and modern body armour better could easily make it fit edged weapons and low-tech armour worse ... so it might not be a good idea except in games where muscle-powered weapons rarely face armoured opponents.