Some odd DPS'ers who don't get the subtle hint of "attack target X, durp durp be durp durp" get to enjoy the terrifying sight of their over-aggroed mob beating them to death! When laid on the ground, they get to look up as a hungry bear eats his face! :-) Eliminating the rubbish DPS'ers by natural selection leaves more room for the quality ones who understand what a polymorph is , what the "X" means or realise that feral tanks need Agility and Stamina items (honestly the rogue who moaned coz I nicked his Agil/Stam ring thinking bears don't use those stats deserved the beating he got! :-)
Maul glyph is FAR more than just aggro on a 2nd target. It's about getting infected wounds up and another SD chance. The ability to hold easier aggro/switch target faster is just a perk.