There are 3 reasons why arcane is not built in yet:
1. I have never encountered arcane mage from the beginning of the Legion, and I do play quite a lot.
2. Rotation is problematic because it has burn phase and conserve phase
3. I am currently stuck with Hunter MM, Rogue Sub/Assa which are way more popular.
Now go to this topic
Skip points 1 and 2, go directly to step 3 and try to write me a priority list that's not retarded as the one from IcyVeins