If Amazon ran a buffet, there would be a flat fee for access. All the food, mostly old, would be in a pile and peppered with randomly dispersed, appetizing, but extra cost items.
Regardless of the analogy, that lego sorting method is a hell of a lot more useful...
Much easier to find a red 2x1 in a bucket of 2x1s than a bucket of reds.
Much easier to find a red 2x1 in a bucket of 2x1s than a bucket of reds.