Detailed Design & Drawing before start of the project

The topic sounds strange in real estate and in the field of construction related to buildings. I was talking to various architects and all of them showed a common constraint and that is the mind of owner and so many fears architect and owner posess.
But one question remain and that is what about the detailed drawings of features. There are some areas which are very much common like stair case and plumbing drawings and other MEP drawings which if correlated in the begning saves lot of changes while construction.
We all know this but still??????
We should think on this and try to figure out the way by which we can control the cost by the way of controlling too many changes. This will optimize the cost and time both and I think then we can give more time to our engineers to spend with their familise which otherwise is a rare commodity in construction industry.