Today's player are so lacking in physical toughness. Guys like Jordan and Bird almost never missed a game.
Whether or not anyone agrees with that, we can at least say that there was no such thing as 'load management' back then. Those guys played 82 game seasons with the same playoff format as well. Yet, today's players want to talk about how they are more athletic. If your more athletic, you should not need load management.
The thing is, today's players all want to extend their careers, and their prime years, as much as possible to extend their total incomes. Players back then never really considered that , they were paid to play, so they played every night.