And I can't even answer who has the toughest, old school mentality today. Most (or all) of the NBA's premiere players would not fit that description. And, sorry, not all players are fans of the concept:
https://www.cbssports.com/nba/news/giannis-antetokounmpo-makes-it-clear-hes-no-fan-of-load-management-i-want-to-play/