I don’t know enough about Architecture to point out the fundamentals that you should be making parallels to.
For novels, typesetting is an incredible false analogy. You need to learn how to communicate via writing on a technical level before you can write creatively (e.g stories).
Back to the shot at agile, I would not expect anyone that never dealt with deadlines or technical scoping to manage timelines for either of those things.
If someone doesn’t even know how to write a game loop, they are going to move on to game design?
If you look at a movie, some of your bad screenplay writing can be fixed via casting. Imagine not having any hands on experience with the process, but alas, you move on to movie director because you took movie directing 101. It’s insane, design is a holistic process that requires a lot of exposure.