All the lessons I had, I was told to keep the left foot planted and to start the downswing I was told to imagine there was a wet sponge under my left heel and I had to push down to squeeze the water out.
As mentioned above Nicklaus lifted his heel while swing, didn't do him much harm, I guess as in all areas, things just keep circling around. Coaches will no doubt start to tell pupils that lifting the left heel is okay and they won't be as strict in telling pupils to keep the foot planted, lifting the heel will then become the norm or a few years.
The golf swing is unique to everyone and so long as you are getting the result you intended and can repeat the swing shot after shot, who cares if your left heel dances around likes it been possessed by a 70's disco diva.
