If your FC is like mine, people will fill the tabs with level 10 white-grade armour, or 20 parasols, or some low level food, thinking they are being helpful.
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Probably a combination of all of them. We know that their database is a nightmare because every time they have to inevitably increase our inventory, be it our armory, the glamour dresser or the armoire for event items, it is a massive undertaking. Or in the case of ShB they removed one of our armor slots and reshuffled the inventory space that got freed up by it, most likely because giving us 50 more armory slots would've melted something.