College basketball the last several years was much, much more physical than the NBA used to be. Watch some old game on ESPN Classic sometime. There was no one hand checking the ball handler as soon as the touched the ball, almost every time they touched the ball. There was no team that as a matter of course hit every player every time they cut towards the basket. Sure, post play was physical. But the rest of it? No.
As an example, in 72-73, right in the time frame you are talking about, a guy who weighed 150 pounds averaged 34 points per game in the NBA (and over 11 assists per game as well). You are talking about an era where teams scored points by the bushelbasketful, even though guys generally did not shoot the ball nearly as well as they do today. In 67-68 the average NBA team scored 117 points per game. And oh, yeah, there was no three point shot then to inflate scoring either. In 68-69 it was 112. Then 117. Then 112. Then 110. In the aforementioned 72-73 season it was 108. And still, no three point shot.
The NBA of that era wasn't some physical, defense first league. It was much closer to the free flowing, offense over all league of the early 60s than physical, banging league it would eventually become. It is ironic that they are attempting to make the style of play in college basketball much closer to that style of play and yet you still decry the attempt to actually enforce the rules. Oscar Robertson didn't average a triple double in the early 60s (and was kinda close to doing it five years in a row) because teams were playing hard nosed physical defense. He did it for exactly the opposite reason, that most teams were not playing anything close to good physical defense.