I didn't mean "standardized" as in interchangeable parts or uniform sizing. I meant standardized as in limited selection, like how armies have historically standardized their equipment. You want a pair of boots, for example? Then choose from a handful of types with limited options, and everyone picks from the same list. There is no reason for Zappos to carry 2,600 types of mens boots other than fashion.

Similarly, there is no reason for Home Depot to carry 500 types of toilet seat other than fashion. The seats are "standardized" in that they are interchangeable, but there is no standard toilet seat style that everyone uses. You could do the same with lots of other consumer goods: everyone uses the same shower faucet, the same knife set, or the same style of flashlight. The world would save a tremendous amount of money and material by manufacturing everyday thing at scale and refining the designs to near-perfection.

I'm not advocating for such a world, though. It would be incredibly bland and boring.