What are the principal advantages of creating a conceptual design model using masses before diving into the detailed design and building element modeling?

One, of the main advantages is that if the client does not like the overall massing of the site and would like it changed, then it is very simple to do so. That can be said if and only if the details haven't been dived into yet. If the details were already all worked out, then once the massing changes were made by the modeler due to the client request, then the details would have to be redone to a certain degree. Creating an inefficient workflow.

Can you think of any examples of a real building around the world that most likely was created by exploring the form using conceptual mass models?