Do you write perfect scripts first time? No? Me neither.
Why do you have to put a script away for weeks before looking at it again? It's to do with viewpoint. When you write you are being The Writer, but to evaluate what you've written you can't be that any more, you have to be the audience.
Some people are better at changing over than others, some people can't do it ever. Some can't change back - which you have to in order to write again. Putting time between the writing and the editing helps.
What's that got to do with this business model? (Apart from the fact that every distinct bit requires a different viewpoint?) Because after the writing comes the quality control. You have to evaluate it, you have to see what you could be doing better.
It's in this section that you get yourself training (whether proper courses, reading books, blogs, getting consultancy - whatever). And demonstrating you've improved.
We're nearly there now just one more to go.
What's on the turntable? "I remember you" by the Eurythmics from "Revenge"