Start with the question
What made Zayton legible to a merchant-traveller?
In the chapter devoted to Zayton, Marco Polo does not begin with monuments. He begins with the harbour. Ships arrive from India with spices and other valuable cargo, merchants gather around that traffic, and customs revenue turns the port into an asset of the Yuan state.
That commercial viewpoint matters. It helps explain why Quanzhou's World Heritage property includes production sites, bridges, docks, navigation markers and administrative remains as well as religious buildings. The city was impressive because many systems worked together.