Giving a XP boost to DPS instead of tank.

[MistakeNot]

I just find it always ironic that the majority of return players play DPS when almost all the group content is easier to experience if you go tank or healer. Otherwise, you get stuck in queue for potentially a half an hour sometimes on these dungeons right now. Meanwhile, tanks are living the dream.

Tanks have an easier time to get into group content. Once in there they usually have it harder than DPS though since almost all problems will be blamed on the tank and/or healer - simply because when those make mistakes it is usually far more obvious than when a DPS makes mistakes.
So lots of people prefer playing DPS since they are seen as easier to play - even if that isn't quite true.