I just started also reading his latest book, Suddenly a knock on the door. I don't think I'll write on each story, but on some of them.
The first story, Suddenly a knock on the door, is as you say Edna about creation, but I would describe it a bit differently. The story is how life and some action is both necessary for creation - the knock on the door, something happening - but also constantly disturbs it. People demand a story from him at gun point - he feels pressure and all he asks for is some quite time to work and then he will easily manage to write, but he also needs the action to create, as as you say Edna one doesn't create out of nothing. He both needs the knock on the door in order to create, but also the knocks constantly stop the creation process.
We have seen many movies with the author sitting in a cabin and just yearning for a knock on the door to save him/her from the silence and boredom, but at the same time the author chose that quite cabin as the only place to work. Here there are the people demanding a story from him to save them from their boring life, but he needs them, the readers, to save him from his boring life.
It's a great story, but I was wondering about how we read it as about creation in general and not simply Etagr's creation process. What he describes is not true for everyone, nor does he claim it to be true for everyone, and yet because it isn't I feel somewhat disturbed.
I find the image, suddenly a knock on the door, a terrific image of a moment which is both responsible for creation (in providing source-material and action) and for its negation (in being a disturbance, and the way life stops you from creating).
We'll see how this motif continues in the book.