Nothing is wrong with their physical or mental approach to the game, but they want to work hard at what they are doing, so they feel like they are getting better. Just imagine how hard it must be for someone to have a bad outing, and then having to wait five days to redeem himself. He must face all his teammates and all his family and friends for that five days with the taste of that last defeat fresh in his mouth. For a lot of pitchers, the demons eat away at their confidence and they start to doubt their abilities. Some of the craziest ideas can pop into a guy's head on an eight-hour bus ride home.
Most times there is nothing to do but think.
There are a lot of demons on the bus. As a result, some fall into a trap of changing a lot of things just because they have the time to do it. Most players got to pro ball through a lot of hard work and it is difficult for them to stay put for the four days in between. And while I most emphatically agree that the clubhouse bond with your teammates is very important over the course of the long season, I can guarantee that the conversations relayed here will not cause any problems with that rule. I am very cautious about what I write and always get permission to use a story about someone.