As the title dictates, I think that if a shield receives javelins or throwing axes, this should weigh down the user of the shield, correspondent to the weight of each thrown item as it would sit in an inventory.
With regards to arrows, I think if there were a certain number embedded into a shield, this should also weigh down, but there could be introduced a cool animation to chop them away.
With regards to arrows, I think if there were a certain number embedded into a shield, this should also weigh down, but there could be introduced a cool animation to chop them away.