[Jtsummers]

To expand on your point: Queueing theory applies whether the thing is a proper FIFO queue, a LIFO stack, a statically prioritized priority queue, a dynamically prioritized priority queue, or a bunch of cards grabbed randomly out of a hat. If things keep coming in faster than they can be handled, the queue, no matter its form, will just continue to grow. That a backlog is not a proper FIFO queue in most orgs doesn't change this fact.