God do I hate it when a function is broken down into sub functions that are only called once for the sake of readability. And then these sub functions themselves are broken down too until you have Bob Martins magical 5 to 10 line functions.
On the surface that looks like clarity, but when do you have to look at that code? Often when you need to fix an issue or extend a functionality. You need to understand what's going on in detail.
When you debug a workflow or Algorithm in a code base like this you have to jump from one function to the next and suddenly you are 6 layers deep and totally lost the context. It is so much harder to grasp code structured like this compared to simple linear flows where each step is marked by inline comments.