Jorge took a lot of time to learn the proper form when he first started playing tennis. This meant that he progressed a little slower than some other people because he was concentrating on the movements during practice. Which BEST explains why this is a good idea? He is training his competition to underestimate him.
He will do better if he has good form than if he is skilled player.
Once he has mastered form, there is nothing else he needs to learn.
He will naturally have proper form later and reduce the chance of injury.