Why use Twin Slot Shelving over any other shelving system?

elfa Twin Slot Shelving System - Shelf Bracket - Various Lengths

How to fix a twin shelving system into wall? 0 · Is my analysis of a closet system correct? ( Elfa, IKEA

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land of gold slot png Traditional Twin-Slot Elfa Shelving Traditional twin-slot from elfa requires upright wall bands to be screwed directly to the wall