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Have you ever done a group project in school, university or at your work place? Making sure that everyone is exactly on the same page regarding what you are doing and how you are supposed to do that is nearly impossible once you have a handful of people discussing something. In face-to-face meetings you can work out a common ground based on hearing what the other party responds regarding your statements. But alas, this is not possible when writing a book. 

A book is a one-sided communication channel. You assume you know how your words will be interpreted, but you can't make sure that everyone understands what you are saying. Every person has a different communication style, different experiences, different expectations and different opinions. Making sure that it's perfectly understood by everyone what you want to say with your first try of communicating with them via a written medium is simply impossible. Don't get hung up on the idea that you need to be able to write something that is so easy to interpret that everyone will "get it". 

Think about your target audience. That is a group that is small enough for you to focus your word choice, structure and overall your writing style on. For this small group you can make reasonable assumptions to make sure that a majority of them will be able to infer what you are trying to say if you are trying to make bring a certain interpretation across. For other groups you can just hope. Hope and move on, trying to write the best possible version of what you are envisioning.