Kardia is overkill most of the time except in savage+ and only then it's with an undergeared tank. If you want to feel feisty feel free to move it around to heal low health people and conserve resources, it adds a -relatively superficial- layer of skill/engagement. Then again you should rarely if ever run out of resources to begin with, and you'll rarely be in a position when the heal from kardia is significant. So, move it around for fun.