[Penguin]

Let's take Fire/Holy as an example. Instead of taking Judgment Beam, which has a recharge time and eats one of my hotbar slots, why wouldn't I take Primordial Flame for the 15% extra damage that it would provide every single one of my spells? Boring? Sure, but undeniably effective. The DPS increase or situational coverage of the master must be worth more than the value I'd get from an aura or stance, and for the vast majority of masters, that's not the case.

Holy beam is great and it does not have a charge time.