I think the fact that chests are the same size as the toolbar-not-included character inventory is a perfect match. If anything, I'd advocate another Personal Character Inventory item to supplement the Piggybank and Safe. A 4-tall, 2-wide Locker item would be nice. As Terraria adds more items and tools, I find myself wanting to have more of them readily available to me when I world-hop. (I strip-mine worlds for finite materials now and then. Extra inter-world storage would be handy, both for tool storage as well as transferring items/resources.)
Then again, I would also like to be able to open 2 chests at once for item management. (I'm a hoarder and collector. I also like having alternate load-outs.)