Man this is the base of armory system. Removing the freedom of changing class everywhere would not only be terrible annoying (just imagine you in Mor Dhona grinding...your weapon suffers heavy damage effect...what now?) but also would mutilate the game. JUst turn your game box and read its back...Armory system and guildleve system are the only points there. They are two of the pillars this game was built on.

People need to keep in mind that the primary description of this game is "Freedom" (at least the first serious description, after all the bashing lol). The game was built on the idea that the player would be free to be the way he wants. He is free to customize the character look, to wear any armor he wants, to play the class he wants whenever he wants the way he wants (that's why most skills are free to be used by every class and the affinity trait exists).