While I wouldn't be opposed to the idea of dual wielding medium/small shields, I don't really see the practicality, other than turning your PLD into a MNK with Block instead of Guard.
Now, what I think would be more useful would be to treat sword and shield as two weapon fighting. Just like dual wield, you would strike once with your sword, then one with the shield. Give the shield a delay for attacking purposes.
Break Shield Mastery down into tiers like Dual Wield I, II, III, IV and V. Give PLD Shield Master I, II, III, IV, and V. Shield Mastery acts as PLDs Dual Wield by reducing delay.

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or 'axes'
, they can wield 'shields' in the same manner as well.
As to the question of why a PLD would use these weapons, the simple answer would be because of the native affinity and A+ skill rating PLDs have that would really bring the "shield" functionality coupled with these weapons to life like no other job could. One can't help but to be jealous at how often a PLD's shield can actually trigger versus any other shield wielding job, so with this weapon in hand, the weapon's design would be fully realized during combat. That, and it was designed concept wise to be available to jobs that have a native shield skill rating, so that's PLD, WAR, WHM, RDM, THF, and BST.