I posted an idea on here a while ago that didn’t get any traction. It was a suggestion to change the Aether Attunement talent apply to all missile casts, not just every few, and to swap its position with High Voltage in the spec tree, making it a cleave-centric capstone talent. I believe this would put more emphasis on player choice between single-target and cleave output. But that may be beside the point.
In my view, if Arcane is going to be inferior to the other two specs when it comes to AoE, It should at least do competitive single-target prio/boss damage, which currently it is still lacking, at least compared to fire, even after the 8% buff. I would agree with the previous suggestion that single-target spells like AB could be buffed without breaking the spec. In its current state, I don’t see any scenario where you would play Arcane over the other specs.