With Starsurge increasing the damage of your next Starfire, it’s finally worth casting, even outside of Nature’s Grace. But we still have one spell that is seemingly dead in PvE - Moonfire. Sunfire effectively replaced it in our rotation, because it’s too expensive and not effective enough to keep both of the dots up.
Next phase, I think the devs should add something to help Moonfire out. It could have a rune that makes it so that, when you apply Moonfire to your target, it takes more damage from your Starfire, or is more likely to get crit by it.
Alternatively, there could be a rune that makes your dots last longer, which I think would make both Moonfire and Sunfire better in PvE.
Either way, I think something should be done about it next phase.