It would only be beneficial to use Seed of Corruption on 3+ targets as the 2.5s cast time is greater than the GCD for casting Corruption.
I just hope there will be a difference now between a demo lock and beastmastery hunter. The mechanics there are almost the same. And unfortunately, both not much fun.
My first main was a mage and they ruined mages. I turned to locks thinking they couldn't possibly eff them up. Boy did they prove me wrong.
None of this sounds good?
The immobility of the destruction warlock is just ridiculous. Why they cant allow at least one major cast be casting while running like it was before, e.g. Chaosbolt or just Incinerate. Fire and Brimstone is still just a joke and unplayable. Sure, they some good changes, but overall it's disappointing. The rotation seems to be boring at all and the havoc changes might good for balancing this subclass, but I see no gain on the other in exchange.