Kardia is just fluff and is strong enough for what it is supposed to do. It's something that they needed to come up because Eos/Selene exist and any buff/change to Kardia would also trigger a change to Embrace and it would be more balancing than it would be worth.

As for DPS, we really don't need another thread asking for a better DPS rotation, as their stance on healer DPS is very clear. Every healer need something different, not just Sage.