Originally Posted by
Archimtiros
It's absolutely counter intuitive, and I think we should prioritize Execute more, but whats intuitive is rarely what is best (which is a primary complaint I have with WoW design for the last few years).
Mortal Combo allows you to use 2 MS, but what's the gain in that? Due to the change, every ability used has an equal chance of proccing Tactician - 0.65% of rage. While abilities have differing rage costs which means a slightly higher or lower chance to proc during that one GCD, it's important to look at the big picture. Arms isn't a completely GCD locked spec, and rage is often a bigger factor, especially where CS comes in.
With the Legendary Gloves, Mortal Combo increases greatly, as we then have a 13% chance for an effective 5 rage cost, but the main draw of Mortal Strike is in it's synergy with Precise Strikes/Shattered Defenses, and Mortal Combo doesn't do anything to address that. Meanwhile, In for the Kill noticeably improves the Execute rotation as a whole, doubly so with the Legendary Gloves.
Finally, while Trauma doesn't do anything specific for Tactician, that isn't the only aspect of the spec, and it really just doesn't have a lot of competition. Deadly Calm is definitely strong but it's pretty circumstantial, in that it's only really useful once during the Execute phase, whereas Trauma adds a noticeable amount of consistent damage.