they could easily add the sounds in..
chadz just likes ninjas too much
And thats true alot of armor comes mixed and most heavier armor comes with padding underneath but it depends on whats on top in order to get the bonus. Think of all the new armors they could add, atleast 3x more armors because usually there is one armor that has 12 weight with 35 armor and 10 leg armor but with this there could be 3 different armors(possible even more if underneath the armor mattered!(cloth padding, leather, more mail etc
))
Think of he amount of variation and tactics that could be added. i.e. dueling a longswordsmen you put on some good cut armor etc etc.
Im not sure how they could possibly even fill that many armor slots that would be made available but i'm sure there are many useable ones floating around in other mods and we could always have competitions inside the community to create the best armor and stuff...
edit: crafting should be implemented ;) craft a milanese plate with heavy mail and padded cloth underneath
but im sure craftinbg has been talked about before and impossible so nevermind