> That's what a good PM and developer pair should be doing, it's just that it's a lot faster for both of them now to review and work in tandem to get the feature done, because the bottleneck is the code generation.

The bottleneck is understanding, never "code generation."

Below is an an axiom which has served me well over the years. Perhaps it will for you as well.

  When making software, remember that it is a snapshot of 
  your understanding of the problem. It states to all, 
  including your future-self, your approach, clarity, and 
  appropriateness of the solution for the problem at hand. 
  Choose your statements wisely.