Pesachim 69a - Systems Thinking and Halachik Relevance

Matmonim: Daf Yomi by Rabbi David Lapin - A podcast by Rabbi David Lapin

The Shulchan Aruch and other codifiers mostly omit sections to do with Temple Laws not applicable in our times. The exception is the Rambam, who codifies the whole system of Halachik thought. What is the foundation of their differing world-views?