My issue with Kaiten isn't even the potential multiple misuses. Though I won't deny that a misused Kaiten basically costs you two gcds, and that stings. As was pointed out earlier, Kaiten will ALWAYS be paired with iaijutsu. This makes iaijutsu rely on multiple resources, and few things in this game piss me off more than skills that require multiple resources to use. Guren and Senei suffer the same as well. As does Third Eye.

Many things can be done to trim SAMs hedges that is for sure.