The answer is there is some clubface rotation in the golf swing. The key is you should have as little clubface rotation as possible. Most players have excessive rotation throughout the swing. The more energy you put into fixing the club face position on the downswing the less speed you can create.
The problem with too much club face rotation on the back swing is it take too much rotation to square the face on the downswing. I would estimate that at least 75% of golfers rotate the club too much, putting included.
The face rotation on the back swing allows us to take a longer back swing unfortunately. This comes from rotating the forearms at the start of the back swing. Again, remember the more you rotate the club face on the back swing the more you will need to rotate the face on the down swing.
The square up a open face on the down swing this normally requires the body to slow down allowing time for the face to square up. This is a major power loss.
If you want to hit is straighter and farther learn to rotate your forearms less in the back and down swing. This will make your swing a little shorter and feel much shorter. But you will improve if you have a more square to closed face.
