Again Joe tells it the way it was.
All the teams were a bit guilty of thugery even before the 80's. This is why the Center positon was so critical, he was the only guy who could get a foul called when he went up for a shot with two players hanging on him.
For years the Sixers got beat out of the finals by the Celtics, led by Parish, McHale and Bird. They had to get Moses to beat the crap out of those guys, and that was enough to put them in the finals, nearly sweeping the league in the playoffs.
Every team after that was worse and worse in terms of their physical play upto the Pistons. The league cracked down on the play after that, and the Jordan era came along. If you breathed on MJ and he felt it, it was a foul.
The difference is, the teams prior to the Pistons were far more finesse teams, better shooting, strong inside play, etc. As the 80's went on, the play got worse and worse, more physical, less finesse, worse shooting and harder fouls.