The fights themselves will do the restricting. Main blm? Doing an AOE heavy fight? Be prepared to have your damage gated because of movement. Boss hits like a freight train? Save those defensive cooldowns for the big ones or in the case of warrior comboing alot of storm's path. Monks have to deal with keeping GL3 up as long as possible. Lose it and dps drops significantly. Some fights force you to lose the stacks. Dragoons are jump management. Weaving them properly into combos or using them as the situation dictates with up to 3 minute cooldowns gates them. Summoners have to manage DOTs and pets especially when pet is in obey and has to be positioned. All have pros and cons. Bards are the most situational aware dps because of ballads. They have to stop, cast a ballad, then open fire again. Sometimes in unfavorable conditions. I won't speak for healers.