Yeah, aMoC's "special" thing of reducing the CD to a minute is stupid. The number of situations in which it would matter or change anything are like nonexistant, even with multiple targets. If it's on a boss, the boss will likely be dead or too near dead to bother with aMoC after 60s, and if it's on an add, that add probably has too low health to bother with aMoC at all sub 20%.
Maybe if it reduced it by like a minute and 50 seconds so you could use it on additional targets but not be able to just spam it wildly on every target below 20. Even then it wouldn't be that fantastic.