It's a simple term that encapsulates the fact that relationships at work can reasonably be non-intimate, inconsequential, unimportant and even, dare I say it, disposable or substitutable.
2019年6月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
不重要的；无意义的；微不足道的
If you describe something or someone as unimportant, you mean that they do not have much influence, effect, or value, and are therefore not worth serious consideration.