In the word processor example, OOP makes it easy to see how say the image object participates in layout, rendering, printing, etc. However, it makes it much harder to see how the layout algorithm or the rendering algorithm or the printing algorithm works. FP has the opposite set of strengths and weaknesses. Easy to see how an operation works, hard to see all the ways a variant is used.

But its not realistic to treat both cases as being of equal weight. In practice, your work will be doing something like fixing the layout algorithm or optimizing the rendering algorithm. Being able to easily grok an operation is much more valuable than being able to easily grok the behaviors of a particular variant.