Maybe this Tomaz Mencinger article is relevant to the discussion?
I thought this part was particularly interesting:
Adults are often impatient, especially if they haven’t trained in any sport previously in their life. They have no idea whatsoever how long it takes to develop correct foundations of a stroke and therefore want to have good technique very soon.
They see themselves as smart and competent and believe that moving the racquet in a certain way shouldn’t be such a problem. Therefore, they are not patient and then want to take shortcuts in the process.
In most cases, adults simply follow the instruction of tennis techniques to the T and do not allow the subconscious to take over. In the process, they destroy the body’s ability to naturally generate effortless force through optimal speed of movement of certain levers and using certain swings and momentums.
I have personally been teaching tennis to kids and adults for over 20 years, and the difference in the learning process when ONLY the analytical approach is taught is enormous.
Simply put, kids combine the technical analytical instruction with their desire to be comfortable (which is nothing else than the body’s signal of telling you what is a natural way of generating force), while adults do everything in their power to perform the movement “correctly,” even when it doesn’t feel comfortable and it doesn’t produce any natural force.