We can go a lot wider in PQA than we can in stories. If we learn that Patrick talks to chimps, then we can develop that and see where it goes. It may develop into a scene of extended PQA. There is so much freedom in PQA. However, if we are working to develop a story, it is advisable that we stay close to the original three structures and the script and the three locations.
That is one difference between PQA and stories.
Related: