That's why I'm not sure what they plan with those abilities, was just pointing out that there is an obvious design in there we don't understand yet. I'm not sure it's removal simply because Serpent Sting just got changed a decent bit, but I think soulfire fits in well with the rest of them as a "why does it exist if it's not worth casting?".
A lot of people probably wouldn't like it to be a huge nuke that does like 4+ chaos bolts worth of dmg, some would, but I doubt they'll do that regardless because that'd be brokenly strong on a lot of fights.