There is a lot to unpack with this post, and while I'm glad you brought it up I'm going to hold back on some details because I'm out doing stuff.
1. Switching on picks isn't a passing fad. The two teams who committed to it the most this season were the Warriors and Rockets. Reason being, teams are okay with a mismatch over helping off a three point shooter to shut down the paint. The key is personnel on the floor. If all five defenders have the mobility to stay with the initiator of the play and decent length to contest a different pisition, the worst you give up is a contested close shot. Since refs haven't called fouls off penetration like they used to, it will be a contested shot with some body contact. Teams have been willing to put up with that over a wide open corner three.
2. The trade deadline deal brought good length at multiple positions, because the Cavs saw switching as their best shot against either the Warriors or Rockets.
3. The place where the Cavs really got in deep water was Kerr's counter: Javale McGee. He was scoring easily over George Hill, and so the Cavs dug into a different look - trapping the ball. This wasn't as successful because the Warriors usually came away with an open three.
As always, good offense is going to win against good defense. The Cavs need a talent infusion, but don't throw the baby out with the bathwater. Switching off picks isnt going anywhere.