Not hard to play defense in an era where half the guys on the floor can't even shoot.
80s scoring was higher than any season from 1990-2017
90s ball was just at a slower pace and then the pace ramped up around 2015. Add to that the stat nerds telling teams they need to pump high volume 3 pt shooting and how much defenses are handicapped
Even legalizing zone while implementing defensive 3 seconds inevitably meant that there would be more ball movement, outside shooting, and transition. The leagues executives themselves mandated that the game be sped up and opened up more by gradual rule changes for 20 years now….