Well this new mastery is just Multistrike Legion style for us or crit chance on chaosbolts. I don't really see a problem with that and I might actually like a spec to want something besides mastery. I don't see anyone else crying about big nukes not critting and dealing 50% damage of a crit. Sure, guaranteed damage on our spenders might look good, but with a partially RNG resource income, getting 0 shards from immolate means that mastery adds 0, compared to it always working on everything like it is in Legion.