Here is the way we have to start looking at this stuff....IMHO
Golf is hard and if we expect to grow the game we have to make it where more people want to play. The anchored stroke had brought many back to the game at an older age after they had quit playing or it increased the times they played. there are 60,000,000 million golfers in the world.
The governing bodies have evidence of what the ball and the new drivers can do but they the anchored stroke (not the putters) without evidence that it was a direct benefit.
All of this is being done to affect maybe 50 guys in the world during any given week. AND IT WILL HAVE A DIRECT EFFECT ON THE GROWTH OF THE GAME.