Just looked up the 50 highest scoring teams on NBA history, and only 8 were in this century.
Because of pace of play and the things mentioned above. Since 1973, this year's 115 pts per 100 possession average is the most ever. Teams didn't break 100 until right before the introduction of the 3 point line. Just in the last decade, average team points per possession is up over 9 points per game.
One of the takeaways from the send-a-message Caitlin Clark knockdown is that the WNBA is resembling the NBA more than ever.
This cheap shot aspect of the Clark saga is over hyped for the headlines. One of the criticisms of her at Iowa was she does virtually nothing without the ball in her hand, so teams are picking her up full court and denying her access. Of course they're being a bit physical with her, she's a frail 3 point shooter, but it's largely by the book. She doesn't need rule changes as much as she needs better teammates.