Iam not convinced Ideal is the meta pick for anything but Cata. Its just what people take, because the broadly available guides are made for cata, where Ideal is 100% superior to Heroism. Herosim allows you to onshot everything with an exe heavy to the head at any time without setup. M&S heavy spam has enough cleave and stagger power that you wont ever have to worry about missing out on that part of Ideal.
Both Talents have their place. VoKT on the other hand is just a trap. Instead of taking one of the best damage Talents in the game, you get some sudo killing power that either doesnt proc, because of your low crit chance, or would have killed the target long before it does, because you are missing out on up to 30% damage each hit.