I liked having Miasma 2. I liked having Aero 3.
...ok, no one gave two Loporrits about Stella, but it's the thought that counts uwu
But healers can totally have more buttons to press without it diving into a glorified DPS mode. Heck, if you want, you can just make those buttons gimmicks, like procs as Allegor said.
I don't think these buttons that aren't meant to turn your gameplay into a full rotation would hamper your performance on prog. You don't have to think about them any more than you already do for Dia, Afflatus Misery, Assize...