I think that Blizzard's stance on that issue is that they usually will not penalize a player for using or abusing a mechanic that they do not consider an exploit but more of an oversight. Dropping group in a dungeon to allow a player to receive full experience that he would otherwise be unable to get on his own is something they see as an exploit. Running around tagging outdoor mobs for others to kill for your benefit is something they would probably call "clever use of mechanics." Note that they did not remove the capability to do this, nor have they threatened to remove players who do it. They simply lowered the xp to make it less likely that anyone else does it.
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