Replenish being self-targetable is intended, yes. MP restorative abilities are not exactly leading the pack for "overpowered" that I feel like anyone who's already willing to set Basic Skill or run Squire as a carrier needs to hop through even more hoops. It's not like Reinforce where being able to Reraise yourself instantly is absurdly good (it means you're a cockroach who can't die with no MP or CT limitations), or Yell where it heavily encourages you to self-target so that you can Yell even faster. Unlike these two, Replenish has no particular application where you're encouraged to self-target.
Speaking of Heal, it got a mild nerf - no longer cures Undead, Blood Suck, or Death Sentence. The first two so that HOLY WATER!! can be emphasized more, the latter because you really don't need to be able to abuse Death Sentence on your units more (being hit by Death Sentence then just negating the drawback on your last turn was pretty common and abusive, and it kind of needs help to be a 'negative' status as is. Also I wanted SEKRIT FIST to be scarier okay). Stigma Magic also no longer cures Blood Suck (on the flipside, unlike Heal, it does catch Undead). This does mean Blood Suck is now curable by literally only one thing, Holy Water. I am okay with this >_>