It's a WONDERFUL drill to learn a swinging motion. I tell more advanced players to do it. If you can swing a wedge with your left arm only and produce a small draw. You know how to "swing" with a horizontal hinge.
Then just "slowly" put your right hand back on the club.
I remember a few years ago my Pro giving me this drill to work on the rotation of my left arm through impact (since he is non TGM, it was his way of getting to HH better) I must of hit a ton of wedges that way, the best I got was a straight shot, guess it might be time to go back to it and get that soft draw.
Alex