Exactly! Without the CP formula, players could just put in their favorite pokemon, without worrying about being on the bottom. As of now, there is virtually no variety in gyms.(Dragonite, Tyranitar, Blissey, Gyarados, etc.) If the system were redone, there would definitely be more variety in gyms. For example, There are a lot of defenders that are better than Gyarados, such as Umbreon and Chansey, but people just put in the low-HP low-defense Gyarados to be at the top of the gym.