Too much knowledge sometimes means that you are unlikely to make mistakes by accident and unable to make them on purpose.
4. A mistake may ask a question that could not otherwise have been asked.
Design is just as important as analysis. Analysis helps us to understand things. Design helps us to deliver value. Design is putting together what we have to deliver the values we want. Without design we just have routines. Some of these are very good and were set up by design in the first place. But routines have no way of changing by themselves. There is a major role for routine but also a place for design.