Gotta drop some abilities when you add some new ones in. I don't think dropping a potency modifier is a bad choice. I mean, it's kind of fun but certainly not very high on my list of interesting rotation mechanics. Not sure what they would have dropped instead. Maybe Ikishoten; never really found gauge shortcuts all that compelling. Or maybe Meikyo Shisui, it circumvents Sen Gauge building and I'm not a huge fan of anything that ignores the core of a job's identity. But they had to drop something, SAM is pushing three full bars.

But what do I know? I'm not a game designer.