The scoring was down because of the defense and style of play. Hell Malone the guy Jordan was beating in 97 retired as #2 on the all time leading scorer list
Your really not giving credit to the defense. Go back and look at how physical that Malone/Rodman match up was. KD ain’t dealing with a Rodman who could literally throw him down, hand check him and elbow him in the face and not even get called for a foul
For sure, you watch 90s basketball and it's virtually a different sport. It's not like humanity suddenly evolved in half a generation, the play style and rules changed dramatically. Hip checking alone, basically legal by 90s rules, would completely disrupt 3pt shooting, the allowance for grabbing off the ball prevented guys from getting free looks. The illegality of zone defense disallowed off ball double teaming, the reason why big men were so dominant in the era, you couldn't screen them from receiving the ball in the paint.
It's really hard to compare one dominant team from another decade to another... but that Bulls team, they were a different animal, especially Jordan. If he played in today's league where no one could touch him on his way to the rim, that guy probably averages 40 a game. He's the best ever.