Ya, for sure. NT,NT,NT,AM,AB,Abarr etc. 3 targets is great, 4 is doable, once you start getting to that 5 and above mark tabbing becomes a nightmare, but if you can do it, go for it. Would likely want to switch to frost bomb then for ease.
Think the paragraph describing arcane as the easiest to play could be amended. Damage is roughly divided into thirds, which is the same for fire. Frost damage could be divided into fifths, and could be more difficult to play if you consider having your pet out difficult.
Also, would recommend something along the lines of this for a priority list.
Cast bomb if CD is up or at 6 stacks with no missile proc and less than 2 secs remaining on CD
Cast missiles if proc is >1 or if at 6 charges and mana < 93%
Cast AB if mana > 93%
Cast Abarr if mana< = 85%