Because if you are a level 50 in a 49 warzone with legacy'd WH mods, you will basically be walking around 2-shotting people (on top of having 17k hp). Unfortunately you can only do this once per character.
But it just doesn't last that long you know? You don't stay 49 forever. Just seems like something to not really get stressed about. Heck, since it's such a huge gear disparity at work, then for once SKILL has nothing to do with it, so there's even less to get upset about you know?