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Once 4.0 went live, we calculated that the server couldn't handle the amount of communication stress that the additional increased inventory slots and character item data brought with it.
Therefore, we switched our direction to adding other methods to increase the inventory, or by converting items to a different format to store them, and stopped adding spaces to inventory and the Armoury Chest with the 4.0 expansion.
* Methods such as the chocobo saddlebag and glamour dressers.
Basically, the saddlebag works around the limitation they have with regular inventory.