Because you'd have to open and move a bunch more junk to sort. Meaning more energy to dig up, move, and sort. Presorting makes more sense to me, we are also in

Because you'd have to open and move a bunch more junk to sort. Meaning more energy to dig up, move, and sort. Presorting makes more sense to me, we are also in the habit already to separate certainly materials from rubbish (food waste, non recyclables, etc.)