Back in the good ole days, arcane blast would automatically apply slow, which was probably a little too op. There was also a glyph or talent for arcane that if you broke a polymorph with dmg, it would stun them… So you could poly, ab, ab,ab missile/barrage=dead before stun wore off. I dont know if any of that still exists today, i know the sheep stun doesnt. But thats all they really need to do is add slow to ab and youre good to go lol. Ahh the glory days of arcane hahaha. I cant play it now. Its too much and i dont even want to bother trying to figure out the madness theyve created with that spec. Just stick to frost and play whack a mole on your procs.
I miss Legion Arcane 
Got mine from my vault this week (normal because my guild did our achievement run last week) after my warlock alt got theirs a few weeks back.
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I had an arcane mage nuking everything in M+ yesterday. 2.2m DPS overall in +10 Mists.
Edit: 634 ilevel with spy masters for context
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Do you mind posting a log so that I can see what they were doing?