If Giants existed in BC times...

[Sombre]

Who says the shield of gleaming gold is better at parrying arrows because it's shiny? It's just that it's a magic shield.

The only reason people associate shields and defence at all is the way it's displayed on the unit screen. If weapon damage was added on to strength in the display you'd get the same thing there. Fortunately it isn't, so it's less confusing.