First part true but, regarding the second, sometimes postural abnormalities, such as Lower-Cross and the resultant hyperlordotic lumbar spine, can benefit from and improve quicker and more persistently with "corrective exercises." For example, a competent coach such as yourself would no doubt have the hyperextended lumbar spine unfucked in 30 seconds, however, this chronic condition would persist outside of the gym and likely result in form creep inside the gym. In other words, what you do in an hour inside the gym can't compete with the 23 hours outside the gym when you're dealing with chronic conditions that develop over years.