With regards to Super Teams in Jordan Era, players at that time are competitors as you can see with the way they foul each other. If you've seen the games in the 90s you know that those are not cheap fouls unlike today. Scottie and MJ has been team mates for such a long time and the movements of players changing teams at that time are less. There are less stars changing teams at that time.
Back in the day so called superstars didn't wanna team up with another superstar, they wanted to beat them.
Rules changed so much that I could easily say today's players are simply soft(er).
hand-checking, no def 3 seconds, no defensive perimeter, etc.
players like Irving would start crying after 5min if he was guarded by Starks or Dumars.
General public, TV companies, and owners wanted more excitement, speed up the game, etc so they changed the rules.