Full support. If they make those vault expansions cost moonstones, they're going to further alienate the people that are already upset/bitter/jaded/etc about the existing MS expansions. It would only cause them problems in the long run. Almost every other pet sim I've been on has a vault or protected storage of some sort as well as a bank feature by default. As others have said, its a QOL feature we should have had from the beginning.

The description also made me nervous. I'm not against a Banking profession (I voted for it!) but I would want all money/item storage to be unlimited from the start as part of it. If there are activities within the Banking profession that are related to collecting and depositing specific items for display, that would be cool and fun (I've seen it in other games, it's neat). But that needs to NOT be tied to a player's ability to manage their own inventory and safekeeping. As others have said, this is something we should have just had from the start.

The Bank's efficiency should NOT be tied to upgrades, but if for some unfathomable reason it ends up being that way anyway, it can NOT cost MS. Profession upgrades costing MS is already a point of contention and spending MS to store our MS makes me mad just thinking about it haha.