Basically the OP is asking for a nerf to raid gear, why? With the logic used you need to do the same for casual players gear also. So the same penalty would have to apply to group gear also then? You leave out a group geared player can do the very same thing a raid geared player can do in older content. Might not be as effective but its the exact same thing. Group content is tuned to group geared players or so the developers will tell you.