When I learned to play golf in 1969, it was said that 10% of golfers break 100 and it is still same percentage golfers break 100, even though tremendous improvement of equipments and scientific research of golf swing.
Why? Should golf be that difficult?
It is sad to say that Golf is taught wrong way.
If you want to break par each time you tee it up like PGA Tour Players, yes, it is difficult, but to break 100 or even to keep single handicap, it is not that dificult at all.
It is my firm belief that modern teaching is mechanically correct, but physiologically incorrect.
That is why so many golfers suffer backache and other problems like neck and knee pains.
Because human body is not built to twist spine like modern teachings preach.
At Harry Vardon, Bobby Jones Era,, no body had back problem nor any other discomfort because their motions are based on natural body movements. For example, pound down nails, hitting baseball, swinging tennis racket and old time Grass Whip.