It is my experience that "The art of thinking" comes in many shapes.
Some people are very clear in their thinking others are very messy. Some people need to speak rather than think, some people need to think rather than speak. Some people need to Doodle, some do 100 ideas in 10 minutes other do 10 ideas in 100 minutes.
I appreciate the purpose and the methods of the book. I am sure it's a fantastic way... for some people.
It's not necessarily for everyone.