Old system is the precedent system, the anchor system to which the current will always inevitably be compared.
Your proposed system doesn't make it much better, you're still not likely to get an item out of Savage. You'd probably end up with loot stalemates like this as well, with people not rolling on item b until they determined whether they'd get item a or not because one otherwise can't control what drops first (and thus, what stays need or drops to greed first).
