Swinging the clubhead and watching or monitoring the clubhead are two of golfs most common and damaging procedures. And my former self was an expert at both, sadly. The first supplying no structure and much wobble. The second tending towards the straight back , straight through "covering" rather "tracing" of the plane line. You can get pretty good doing those two things but one thing you will not be is terribly consistent (or on plane either).
Swinging the hands not the clubhead was a major eye opener for me. I thought I knew the difference but didnt at all. Yoda can demonstrate the difference in a second but to discuss it verbally is a chore. The flat left wrist , the flying wedges, the frozen right wrist, the hands as clamps, no wobble at the club attachment , pressure points, firm grip pressure being the solution to the flippy and whippy wrists. Its not a handsy action but is all about the hands. I thought I understood this but I didnt.