Who needs to twist?
After 26 years of teaching golf, I have found the following to be representative numbers of all the golfers I have seen and continue to see:
<40% - Can line three balls up perpendicular to the target about 4 inches apart each, and hit the middle ball solid, taking a divot or scrape past the line of balls.
<25% of the above (<10% total) can do the above drill correctly, and hit three consecutive shots that hook or draw doing it
If I had to bet, my numbers are probably too generous, my colleagues who probably say there are less than 10% of all golfers who make a divot in front of the ball, and can do it hitting a draw or hook.
So what?
So, this elite group of golfers, no matter how they arrived in this group, are the group that has contributed to the state of poor golf instruction, albeit through no fault of their own.
Why?
Because, all sorts of silly ideas that might work on this group, would be a disaster for the other 90%+ of golfers. Even completely orthodox procedures may be death moves for this super majority.
None of these moves will destroy most of the 90%+ faster, than a attempt to rotate the clubface open at first parallel to a "toe up" location, and then continue to rotate the left arm and golf club to a slightly "laid off" and somewhat "cupped" left wrist at the top of the backswing.
One of the first things I learned to do when I starting teaching at age 20, was fix the slice. A flat left wrist at the top, and no reverse pivot were the early cures, all the other additions that became the "Never Slice Again 2.0" pattern were added while I tried to make car payments on teaching results alone.
The whole-swing "twistaway" concept is THE way to fix golfers who have never come close to passing the two tests above.
But!
I have given lessons where after 10 minutes, I could start to temper the whole swing twist. First place to start this tempering is at the top of the swing. De-Arching by having the left thumb under will help most "new" pull-hookers hit it where they are looking. The same left-thumb under at last parallel, will de-arch the the other small percentage still hooking too much.
Eventually, the NSA2 pattern, looks like many famous golfers.
Never Slice Again 3 will do a better job in many areas, most especially explaining "Who need to twist."