They're pretty good as Destro on a lot of fights, and there's a few fights where Affli shines.
I guess they want to make Affli shine everywhere and make other locks than Maldiva play Affli on them, lol.
TL;DR - I don't know what's the point of these buffs. Good Warlocks can easily top 5 on most fights. The only fix for Affli they should've done is fixed the Soul Shard mechanic, made Soul Shards regenerate inside combat, that's all that was needed for Affli.