This is one of those kind of pointless at the moment topics that is just looking in the past. It doesn't matter now why they don't get it until 17. But as the devs based many of their ideas on D&D it's one of those things that always slightly bugged me. Rangers were the defacto dual wield class and even specialized it for free at level one in old school DND. But monks were the only class that got it at level one and even warriors and rogues got to dual wield before rangers. I always felt like ranger should have a bonus skill to dual wield as well but it might have created balance chaos and rage in old EQ.