I disagree. I say that the reason scoring has dipped compared to 20 years ago is because offenses were better back then, not because defenses are better now. Not only are there few real centers in the league today, there's no hand checking. The game was also more physical back then compared to now. Nope. They barely called more fouls back then and really the margin should be wider seeing as how they actually had real centers and power forwards that played in the post. The game was a lot more physical back then. You breathe on these cats nowadays and its a foul. Normal every-game routine "hard fouls" from back in the day are flagrant fouls now. The fact is that the game was faster back then, that's not an opinion. They averaged more possessions per game, took more shots, and shot at a higher percentage.
Physical doesn't=better, and defensive rotations are far better today than then.