There are quite a few more issues and necessary fixes than the ones you mentioned.
the 4 set is a talent. I guess you mean the 2-set then. I don´t think malefic affliction is the problem. The problem is that it tracks onto the target and not the spell itself. They fixed it once, so they could fix it again, see:
Also Soulflame is not the issue, it is SoC cast time and shard dumping. Demo have hand of guldan, Destro have Rain of fire. In AoE affli can barely dump all their shards and having to cancel SoC casts due to affixes or mechanics is very punishing.