Basically what Blizzard have done is take the usual bread and butter arcane spec, increase its filler cast time to a 2.1s(ish) cast, gave it unsustainable mana regen and took away it's only semi fun aspect which was quickening.
Surely if you want to actually make the spec fun either allow us to stay at 50 stacks or increase the haste we gain to 5% each cast and reduce the max stacks accordingly.
Currently arcane is pretty !@#$ (patchwerk damage is fine, but it's not necessarily sustainable in mythic raid scenarios) and with the buffs it would have given us leverage to still be competitive on fights where you get feared/stunned/phase transitions. But no, apparently they don't know how to properly build specs and rotations.
What do you guys think?