Because real life stuff is not made of Docker containers that can be deployed in a matter of minutes. My company does test hardware for manufacturers. We have

Because real life stuff is not made of Docker containers that can be deployed in a matter of minutes. My company does test hardware for manufacturers. We have multiple project we're working on currently but we can't finish some of them simply because we can't get all of the components we need. Because of that these manufactures, can't produce their widget, because they can't test them before shipping. They are some of the biggest corporations in the world and even they can't help us get some of the stuff we need. If they can't get their widgets produced, companies that depend on them can't produce their widgets. If you go deep enough you will find out how everything depends on everything else. Widget 1 is not being produced because it's missing Widget 2. Widget 2 is not being produced because it's missing Widget 3. Widget 3 is not being produced because it's missing Widget 1. Catch-22