The entire NFL is on the verge of major change on offense

Excellent observation.

My son's middle school team lost last night. The team that beat them was undersized and less athletic, but used a lot of motion and misdirection. Another dad and I were talking about how we had seen more of that in College games this season and how well it's worked for the offenses using it. I haven't seen enough of the Eagles, Dolphins, Chiefs and Niners to identify that trend in the pros, but wholly agree that we should copycat it and implement it sooner rather than later.
That's a core of what they do. I joke a lot about it but it but when you really look at the 49ers and Chiefs play, you can see how easy scheming has made it for Purdy and Mahomes. Coupled with some of the best skill players in the game, easy work. The 49ers went to the Super Bowl by beating the Packers by more than 2 scores with Jimmy G throwing the ball 8 times or something crazy like that..lol

Spot on op. Spot on. SP's system was all fine and good while we had Drew. Defenses knew what the Saints were going to do but they still couldn't stop it because we had the most accurate passer of a football in the history of mankind. On top of a first ballot HoF QB we had great interior O line play and great weapons for the system. We were able to run the ball if SP felt like it but he didn't always commit to the run. And with Drew Brees at QB, who can blame him?

The minute Drew retired our offensive approach needed to change. The things that worked with an all time great QB weren't going to work with just about any other QB. And when SP left it was time to completely overhaul the offense. It was like a restaurant losing it's founder and head chef. So the Sous-chef was handed the recipe book and was expected to keep everything going.
Honestly, the offensive approach did begin to change after Drew retired. It was just coupled with having to implement a new offense with one of the worst WR rooms in the league, worst RB rooms in the league, never ending O-line injuries, and 4 different QBs. Pete Carmichael isn't running a Sean Payton offense because Sean Payton offense was predicated on who was under center. Pete Carmichael is building an offense based on the vision that Dennis Allen has set for it.

Think about it like this; in 2021, we beat the Bucs in our first matchup 36-27. With Sean Payton out, Dennis Allen acting head coach and Pete Carmichael calling plays, we win 9-0. That right there should have given us insight into the future.