They have to design classes and jobs now with the future in mind, otherwise they would have to totally revamp every class and job whenever new ones come out. As for Fists of Earth and Wind, again these are pugilist abilities, if you didn't have fists of fire would you just not turn one of these on, no you would still have one up. I've seen plenty of monks just learning Titan go in Fists of wind to make dodging a bit easier, or Earth full time so they take less damage when they don't dodge, but it still remains that fire is your main one, because monks are dps, they need to keep as much up time on their dps stance as possible, and again, it is one of the benefits of monk over pugilist, pugilists don't have access to it. Just because you don't use every ability all the time, doesn't make it useless and need to be replaced. Another thing they have to consider is balance with other classes/jobs and utility, monk already has very high dps, they get an off GCD stun, a ranged stun, aoe silence, they can remove enemy buffs, they can cross class invigorate for TP, giving them TP regen on fists of wind would mean they could basically do anything without ever having to worry about TP, and right now if you use invigorate before your TP hits 0, to start the cooldown rolling, you can go single target for a very long time, aoe however is different, you burn TP, but that is how it is on all classes, you have to learn to manage your resources to maximize your dps with aoe vs. single target, otherwise everyone would just run through aoeing everything without a second thought and we would have early WoW frost mages all over again.
