The Five Second Rule

[Concillian]

I'm just trying to create some seperation between warlocks, mages, and priests. 
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I totally agree, spirit has to have a reason somewhere, and priests make the most sense. Give Priests some reason to want spirit, even if it's not double the regen, give them something, SOME reason to want spirit. Make mana pool dependent on spirit for priests, make spirit affect crit chance, make spirit do something else or something better than it does now. Having it priest specific also makes sense as priests are by nature spiritual.

The current itemization shows that Blizzard thinks spirit is important for priests and mages as the class set items for those classes are pretty spirit heavy. As a result, all the caster classes roll on the blue set Warlock items (Dreadmist set), and blue set priest and mage sets are thrown aside. Epic set items are class specific, so that doesn't happen, but still all caster classes are going for wither primary INT/secondart STA or vice versa. Adding a reason for a class to have spirit suddenly opens up two more kinds of items (INT/SPI and SPI/STA) as at least somewhat desirable.

As pointed out, melee classes have this diversity by making STR the primary stat of some classes and AGI the primary stat of others. Doing so for casters would not only make sense, but improve the itemization mechanics.