I was wondering about something, now this might just be too much math balance which is not the time for yet. But it could be because of the mechanics and so does matter:
Rune of Power will be the best talent choice for Fire spec because of the intricacies of Combustion.
- Combustion scales on ignite> ignite doesn't scale on mirror image > Mirror image is worse for Fire than for Arcane and Frost > If Mirror image is balanced for Arcane and Frost it’s not for Fire.
- Combustion is all about timing, but there is a limit at how long you should wait for a good ignite before the waiting becomes a dps loss > Ice floes makes the timing even more rng so resulting in Rune of Power is better for a more reliable good Combustion.
The Ice Floes vs Rune of Power with Combustion could perhaps be simcrafted and theorized.