In fact, our bodies are quite different. Besides different obvious height and weight differences we also have different degrees of lever lengths (arms and legs have different bone lengths ... arms: from the shoulder to the elbow and from the elbow to the wrist; legs: from the hips to the knees and from the knees to the ankles), different widths of shoulders and pelvis, different angles from the hips to the knees (valgus and varus), differences in the amount of pronation and supination of the foot/ankle, different degrees of forearm angles from the elbows down to the hands (carrying angles), in say nothing about the individual differences in posture, balance, flexibility, core and extremity strength, hand-eye coordination, etc.
There have been several golf books written concerning different body types (endomorph, mesomorph and ectomorph) and the benefits of teaching golfers with different body types to swing in a different ways (The Laws; written by Dr. Jim Suttie).
I evaluate golfers physically every day and they do have significant differences in structure. And, the law of structure governs function is always in play. Therefore, we need to understand how to evaluate and modify a golfer's structure before we are going to safely, efficiently and permanently improve their swing function. Once golfers get this and swing instructors understand this completely, then golf performance and injury prevention will become much easier and more successful.
Let's stop forcing square pegs into round holes. Every golfer's body and swing should not be the same!