"The success of a solution often masks the cost of alternatives not taken.
The useful word in this quote is alternatives. In a data pipeline change where failures can be silent, it points to the part of the decision that will not be solved by effort or optimism. That is where good teams get surprised.
In a data pipeline change where failures can be silent, people argue about preferences when the real issue is structure. You see it in a shortcut that becomes the new operating mode, where the system teaches everyone the wrong behavior. A single written sentence can remove more noise than another meeting, because it stops the renegotiation loop.
Geoffrey Vickers is a reminder to keep it concrete. Write the boundary in a way someone can enforce without asking you. Make the decision legible to the next person who inherits it.