One advantage I've found of this approach is that the graphical overview of the wiring makes spotting architectural 'code smells' easier, which makes it easier

One advantage I've found of this approach is that the graphical overview of the wiring makes spotting architectural 'code smells' easier, which makes it easier to refactor as you go instead of realizing the poor structure farther down the line (ie too late) when the thing is released and you start running into issues caused by the architecture.