With 9.2.5 Blizzard finally decided to buff arcane.
+8% to arcane missiles.
+10% Arcane blast.
While this is nice and a step in the right direction it is little more than a band aid for the problems that arcane is facing. Even taking just damage alone this moderate buff does not put arcane anywhere near destro for dps. At the same time destro has none of the drawbacks arcane has for mana usage.
The real problem is the mana spender design of the class. It needs a total rework. For now, we need a cut in all mana prices for spells to make them more affordable and in turn buff our damage by allowing us to stay in our burn phase longer. A -10% mana cost for all spells would give arcane a little breathing room to work.
Thank you for the buff blizzard, but it is simply not enough. Arcane needs a lot more.