You never want to completely remove reinforcement, however you don’t need to reward every repetition. We eventually get your dog on a differential ratio of reinforcement which means rewarding your dog for exceptional performances. This improves performance instead of rewarding at random which does not reward better than average performances. The analogy I make here comparing dogs to people is, do you ever stop getting paid for going to work? How would you feel if you just stopped getting paid? How would you feel if your boss recognized your good work and gave you credit for that?