[Ranylyn]

Well, 20% of 400+ (Evoker Nuke) is still nearly 100 damage. A Glykin Priest/LB with Phoenix Eternal Flame, Mercalan Mist, and 70% Guard can still be overwhelmed in PVE.

Still, considering the only two methods of 100% guard are either limited to one specific race and cost HP/FP anyways, or incredibly Luck Based (Redtail Fortune Cookie) You raise a valid point that it's not much of an issue.