If they let you change your AC and you don't like that, then you don't have to participate, just because you don't like doesn't mean no one should be able to do it. Besides if they allowed it they could add another money sync in, seems they cant get enough of those.
I an game where it is hard to find dps to fill group spots, let alone tanks and healers. Any and all dual-specing/ AC respecing should be allowed. "Meaningfullness" of a choice in a game, a hobby, is in conflict w/ efficiency and playability of that game. If you are looking for meaningful choices, I suggest you endeavor to live a richer fuller life and not delude yourself that the ones you make in a game have any true meaning.