Where dua actually sits
Nothing in this lesson is an argument for praying less. Dua is not the alternative to preparation and preparation is not the alternative to dua. They are not competing for the same slot.
What is worth watching is the moment when a dua is being used as a way of ending the discomfort you feel about a task. If you notice a small relief straight after, and the file is still closed, that is the mechanism from lesson two wearing better clothes.
The tell is simple and private. After you asked, did anything get opened.