Luis Enrique, Hansi Flick, and Xabi Alonso are highlighted as coaches redefining modern football tactics by adhering to their core beliefs and systems. Enrique's success with PSG, including a Champions League win and a high win percentage, exemplifies this approach. Flick at Barcelona and Alonso at Real Madrid are also noted for their systematic coaching philosophies, emphasizing team structure and player roles over individual stars, signaling a new era in football management.