Storage is a huge Problem in game. And since you shouldn't use the cache that much, but also because it'd be nice to have a visualization of all your stored items at least for better overview i suggest: a storehouse.

i build/machine that lets you store thousands of stacks from materials to whatever.

ideally i'd want it to have a visual representation of each item you've stocked, maybe grouped by categories. stuff on shelves, stuff on the ground, big barrels or boxes

it'd definitely add to realism in the game, be a nice little optical feature and possibly even provide a better overview than the cache in a different way than just adding a sorting UI to it.