I like stacking chests because I subdivide things into chests to increase capacity and general order.
It’s hard to tell if a chest is at capacity or not, until one tries. Trying this on several boxes can be tedious, if one simply wants to stash alchemy ingredients.
One doesn’t always remember which box one has taken something out of to free space.
It’d be nice to have a red outline on the quick-loot frame to indicate a full box, for example.