I already replied on the other thread so I am just gonna link it here.
This can be corrected very easily by either increasing the base proc rate generally at a lower rate or increasing it just for Arcane Blast at a higher one, or some combination.
The main point here is that CC had to be untethered from mana spent in order for us to make any use of the proc in AoE.
This also sets the stage for 4 Charge AB spam to eventually no longer be the norm in ST, but I suspect it will take them a while still to get there. As I said before it’s going to be a journey of baby steps.