At a quick glance:
Aff buffs are worth about 3.5-4% for Soul Harvester. Dunno how much for Hellcaller, a lot more than that.
Destro buffs are worth about 6.3% for the current iteration of Destro. (More on AoE and for Hellcaller obviously). But a sidenote is that it will probably change how Destro is built. If it kills the Shadowburn build (which I would be sad about) then it’d see a much bigger jump in numbers as we end up casting Chaos Bolt way more than we currently do. Between the RoF nerf for Diabolist and the buff to everything BUT Shadowburn, I could see Destro shifting to Hellcaller.
No idea how much the Demo build is gunna be with napkin math, but a reversion of the Dreadstalker core nerf is VERY welcome and it looks like we’ll have a very good 2 minute damage profile with GFG being turbo again.
I’ll wait for Kalamazi to actually figure out the real numbers on these buffs if we change our builds and whatnot.