Why in God's name would that annoy you?
Metal is more durable than plastic. Always. Why would a simple fact such as that bother you? Were you expecting someone to hop in here and be like "No way man, you're totally right- plastic is way more durable than metal"??????????
Personally I am lost as to the purpose of this thread, but trust me- if people with metal bindings are breaking them, hand them plastic ones and see what happens. Be sure to update after the binding carnage ensues.