Ok i actually like
4E because of the way they simplified everything, i mean i got confused playing
3E because everything was so complex, now even a complete newcomer to dnd could understand how to play.
Ok i see how the greyhawk setting might not allow the dragonborn or tieflings right now, but what about when all the settings get updated, what happens then do we stay like we are or do we go with the flow. seriously a tiefling with horns and a tail is a big difference from a fireball slinging pit feind, and now that tieflings are Pc's it might be easier to integrate a reason why they no longer need to be disguised (they were at least partally accepted by society?)
all this is just my opinion