I know it'll be a really unpopular opinion, but I kinda wish they would put Fireborn into another Solar Warlock class (call it Thatanonaut?) and keep Sunsinger more support-based with buffs to your allies. Right now we've got grenades that give +5% damage for everyone (really neglegible in my opinion) on whatever it hits and Song of Flame (which isn't too bad, for one perk). Sure you can use Touch to stack the Viking Funeral effect on Solar grenades or use Radiant Will to make Song last longer, but I kinda wish it was easier to make it more helpful to teammates in the form of buffs, and didn't require that you do very specific things with the subclass. Sunsinger is kinda overused because it's decent everywhere, and it doesn't feel like there's any specialization which you see in other subclasses. That being said, it would probably be a great chore to clean up the grimoire if this were to happen...