I feel like there should be a house or a household items area, where we can move items that have no use written for them. Such as furniture, knickknacks and voila chords etc that we might want to collect. If the item is needed for alchemy or other things, then the use can still be blank, but just so we can put the items of no use somewhere, as it's confusing as to whether the item has a use or not.

It's not at all clear what you are Suggesting here.

Galleries, Vault Categories, and pet Treasure Chests already exist. Nothing stops you from putting your items that you want but don't want to sell in those. The fansite Subetalodge and the Item Database Building in Centropolis will tell you what items do, so you don't have to remember yourself.