I am 100 Firewall Sorceress, I rely on DoT with Burning.
As it has been repeatedly said, Fire Sorcerers are far behind other builds in D4.
I believe the cause is not the Total Damages, it is how slow we apply them.
“Aspect of Ancient Flame” reduces drastically the cast time of spells, but doesn’t trigger with DoT (it requires a critical kill, DoT don’t crit).
Blizzard, you want Fire builds to be viable, please make “Aspect of Ancient Flame” buff work with Burning.
Thank you