You need to not think of it as a damage buff, you need to think of it as a super powered rhizomata. It is an incredible button in prog because you can simply press a single button to get your entire gauge back at any time and get a buff to your GCD heals which doesn’t punish SCH anywhere near as much as it has both ET and spreadlo
If rhizomata or a theoretical lily generator generated all three of their respective healing tool and gave a healing buff you’d expect it to have a downside and a long CD like seraphism, macrocosmos and lilybell all have