You’re way off. You’re trying to look at this as a linear tier list of storage options.

But there is no tier list. You’ve got chests, which are more durable and secure. Then you’ve got crates, which can store items but stat wise are more decorative. Then you’ve got vaults, which are suppose to be the ultimate in safe and secure storage.

These are separate categories and they serve different functions. Yes, they all store items, but that’s not unlike saying “this tool is used to build a house”. A hammer is meant for a different job than a saw.