In my opinion it should mean that you not only consider the relationship transactional, you consider yourself as an independent business operating within a business transaction, an LLC or sole proprietorship if you will. Remove yourself from emotional attachment this way.
This line of thought leads people to naturally adopt the exact same sort optimization (exploitation) strategies businesses (your employer) does with the same justifications they use. As such you should focus on diversifying your employment or making sure you’re diversely employable should you need new revenue streams, have savings and cash reserves for economic downturns, and focus on your profit margins (time invested vs paid) and so on and optimize around these sort of criteria.
Obviously if you have a good transactional relationship and are to some degree dependent on that relationship you don’t do everything possible to undermine it (just as employers have limits they’ll stop at before employees start to flee) but never consider it at any sort of emotional or attached level, it’s merely a strategic relationship and be ready to optimize wherever you can for your LLC depending on its goals (i.e. your goals).