Indeed. And giving it more thought, for the Ig-alima case, a DD would need at least 408 defense before a +30% roll (11 w/pld) would even -begin- to have any effect on damage taken, and very few DDs will have their defense much above that even with Berserk down. For the purpose of being useful for everyone, PDT and phalanx are both more useful to most players.

Though I suppose that may be the point -- they want a roll that will help the pld, but not necessarily make it easy to yet again simply replace the pld with another DD. If it were a PDT roll, you could ignore pld and continue with using war/mnk/sam/etc 'tanks'. If it were a phalanx roll it would be somewhat useful for everyone, but not as useful for dealing with extremely strong/high level enemies.

So, again, it works for the (probable) intended purpose, but the intended purpose isn't functionally useful until something is done with the enmity system, or at least pld's ability to generate hate.