Imagine standing in line at the supermarket, or municipality, or anywhere where you stand in line. The front of the line is near service desk 1. When it’s your

Imagine standing in line at the supermarket, or municipality, or anywhere where you stand in line. The front of the line is near service desk 1. When it’s your turn, you have to walk to service desk 10. As you’re walking to it, service desk 1 frees up, and the person who was behind you in line walks to service desk 1. They arrive in seconds, while you’re still halfway to being served, a few meters away. Op is pointing out that (programming) queues without locking lack a certain purity which is also lacking in real life queues.