Why disruptive retail models must still implement good old-fashioned inventory management?

Why disruptive retail models must still implement good old-fashioned inventory management? The worlds of sustainability and the circular supply chain are clashing headlong with traditional retail principles and processes. This new wave of businesses specialise in, and operate, a variety of models across renting and re-selling. Some of these models still rely on a controlled supply-chain, and pre-ordering, however for many their product assortments exist and evolve through a combination-