[quote=@Valiance]
<Snipped quote by Artifact>

Is that based on simplicity?
[/quote]

That, some experience, and some instinct. Dragons that use precious metals usually have some gimmick, or they have a huge amount of physical force. You would have no problem at all matching that force. I make a good match for mental manipulation, hypnosis, and their ilk. Then bone dragons are never very impressive.