I disagree. Frost is certainly decked out, depending on your talent choices, but fire and arcane are both a bit bland when it comes to their rotation.
Also, if you're struggling for keybinds, you should consider using all the modifiers, i.e. shift, ctrl, and alt. Takes some getting used to but it will do the trick.
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It will be relevant for PvP. If you get locked out of arcane, Frost Bolt (& Fire Blast) allows you to keep slowing/damaging enemies, whereas without them, you'd be entirely useless for the duration of the kick. Arcane especially has suffered from this problem since the pruning.