well so far I have seen all gear drop at least once.

Only issue i had was to win the roll to get the gear but since I'm down to getting the Bard pants it will be a pain since bard pants drop in the last boss of Labyrinth but success rate of dropping is much lower than the other chests due to the last chest containing 2 pieces of gear per class role (Tank, Light Melee( MNK), Medium Melee (DRG), Range, Healer, DPS caster gear) which means there is 1 out of 10 chance it will drop while other chests only have a 1 out of 5 chance to drop.

not to mention the drop rate mose likely will decrease with introduction of new Jobs and class if those new Jobs and class introduce new gameplay style like a DPS that use Tank like armor defense but have DPS gear like stats. However, by then the item limit should likely be lightened or removed.