Wouldn't it average out over time anyway? I.e. sometimes you're unlucky and have to wait twice as long as if you'd arrived to the queue a bit later, sometimes y

Wouldn't it average out over time anyway? I.e. sometimes you're unlucky and have to wait twice as long as if you'd arrived to the queue a bit later, sometimes you're lucky and have your wait time cut in half. Over many store trips it's halfway between the one-queue and two-queue processing time.