Well the video is from patch 1.0
not sure how that fits with your fireball experience. But yes, they did fix something in 1.2:
I wouldn’t be so sure about that.
In the gameplay, we can see his immolator stacks go up to 8 when mapping (up to 10 when bossing). Best roll Immolator before patch 1.1 was +6 spell damage per stack, now it’s +2, so it’s 4 * 8 = 32 spell damage difference.
Patch 1.0 didn’t have weaver idols, so I can now slot humble idols with flat spell damage and also get +32 spell damage. There’s also primordial stuff now.