No waiting for the architects site-visits. No reworking areas built according to plan. That efficiency helps lower contractor bids. Remember the exercise of whispering in someone's ear and passing it down the line, only to hear the last person say something far different from the original message. It happens frequently when building a golf course.
Paper plans are the first whisper.
Workers interpret that whisper when the architect is not there. This often results in a product the architect did not intend. Leadership Driven Architecture ensures the message is clear eliminating communication error. Saving time and money. Even when a concept is understood, a constructor interpreting a master's drawings when left alone without supervision, will inevitably vary from the designer's dream.