Equilibrium has a minute-long CD and Missiles happen much more often than that. Also, oGCD Oaths wouldn't require the use of an extra skill.
In the end I'm not really arguing for how broken or not broken Oaths would be (and neither was MisterBob, judging from his last post). All I pointed out is your comparison wasn't a good argument: you basically said that because WAR can do one oGCD Oath every minute (with a very obvious drawback), Oaths should just be oGCDs.