its been stated that Vault space is a technical limitation
Namely the weapon comparison stat card data doesn't all fit into ram simultaneously when inspecting a proposed enlarged Vault
Here's a hilariously clever solution Bungie
Since the Cursor has a set max movement speed and is not truly random access, we can take advantage of the time delay to load different sections of the Vault into ram cache
Just reorganize the Vault weapon data into a binary space partition tree, then collision check cursor position against it to decide what to load
Easily cut the limit by half even in worst case
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They said a while back that they ran into limitations due to the amount of stuff they can and can't display on screen at once. They need to implement a solution that increases vault space without display more items on the screen. Hmm. Pages in the vault anyone?