What you think is easy to grasp may not be easy to grasp.
What you think is easy to understand may not be easy to understand for other people.
What they think is easy could be hard for others, and vice versa.
You write at a level comfortable for you. For you, it is good. For you, it is suitable as well as satisfactory. You don’t want to make any changes to it.
But what if you discovered that some of your readers may not be understanding your content (or, maybe they found it too simple on the other hand)? What if they may be confused with it? And worse, what if, as a result, they would leave your content?
It’s all related with clarity. If your writing can’t be understood, it won’t be read further. It won’t be appreciated and it won’t be remembered. Would you, the writer of an amazing piece, like that?