I call them myths because it's not important if it's literally true, just that if the executives believe it's true, then they make the right choice. For example, if you have a home grown internal tool, like a database or a messaging system, it's important that the executives believe that it is a competitive advantage for the company so they don't try to replace it. If they try to cut the maintenance of that internal tool out and switch to something cheaper, then it would probably be terrible for the company because engineering would need to rework the whole system that depends on it and it wouldn't end up being cheaper. Same with switching the language you use to Java. Sure you can hire more Java developers, but rewriting the system from scratch or splitting the codebase is probably worse, so just make sure the CEO believes Elixir is key to their success, whether it actually is or not.

Listen to Steve Jobs describe object oriented programming. I'm not sure he even knew what it was, but it worked out for the company that he sold it so well. https://www.youtube.com/watch?v=2kjtQnPqq2U