Turn 8 puts some serious strain on your MP because of the length of the fight and the intensity of the damage, so even a SCH will appreciate piety on that turn (almost all of the other stuff in the game is easily healable without dropping below 70% MP on a SCH though). However, you also have to consider that the increased stats on the Daystar mean that you won't have to heal as much because your heals are stronger and critting more frequently.
Piety is in a bit of a weird spot because of how it scales. Your in-combat mana regeneration is a percentage of your total MP, so as you stack more piety not only are you making your MP pool bigger, you're regenerating it faster too. But spell costs remain the same (and will remain the same until a level cap increase), so if they just keep adding more and more piety on gear with every raid tier MP management will be a complete non-issue because your passive regeneration will outpace most of your heal cost.
I think the way they're going about it is the right way. Make your heals stronger so you don't need to use more expensive spells as frequently, but don't let piety get so crazy that you have no reason to worry about MP.

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