PLEASE BUFF PIETY STAT

[Xidia]

I agree with this entirely: Perhaps treat it more like the Tank's Tenacity stat: Piety could be what it is while also working like a weaker version of Det.

As far as stat weights go for me:
WHM - SS, Det, Crit
AST - Det, Crit, SS (Nocturnal) SS, Det, Crit (Diurnal)
SCH - Crit, Det, SS

That being said, I can only think of one class that actually would get use from this stat currently: AST.

AST has the WORST mana management. Ewer pales in comparison to thin air, assize, aether flow, & energy drain.

I could work with 0 piety on any gear and I'd be just fine.

WHM has Thin Air for instances where AOE healing would be used more than once in a 12 second window, Assize for 10% mana recovery every 48 seconds which can be reduced a further.

SCH has a Aetherflow every 30-45 seconds, and energy drain.

Meanwhile, AST has Ewer. If you have a BRD/MCH/RDM/BLM/SMN on your team, call for a shift/refresh and you're golden.

TL;DR - Piety needs a buff

[Sebazy]

If you're MP limited that much in dungeons, it's almost certainly because of your offensive spells. In which case, stats that boost your damage are going to be more useful than the tiny boost in MP you can get from piety.

Exactly that.

Whilst my testing is very unscientific (Just lots and lots of roulette logs), stacking Pie+Crit just about scrapes me enough MP for an extra holy in the final stretches before each boss. Switching out for Det was generally fine unless I was carrying the DPS. Crit + SS was just unworkable for me. If I took along DPS that were good, it was workable but if the DPS was anything less than that, I was out of gas and cooldowns within the second pull. Not a good situation for any dungeon with more drawn out trash.

Keep in mind tho, I believe that I push my dungeon DPS a lot harder than most averaging 3.8k start to finish in temple for example.

[WayofTime]

Meanwhile, AST has Ewer. If you have a BRD/MCH/RDM/BLM/SMN on your team, call for a shift/refresh and you're golden.

TL;DR - Piety needs a buff

I agree with everything you say here, but want to add that AST has Celestial Opposition to extend their Lucid Dreaming effect (and Ewer if planned properly and they REALLY need MP). While not as evident as Assize and Aetherflow's additional effects, it at least makes it a bit more manageable for an AST instead of just eating their Ewer cards.

[Cynfael]

I agree with this entirely: Perhaps treat it more like the Tank's Tenacity stat: Piety could be what it is while also working like a weaker version of Det.

As far as stat weights go for me:
WHM - SS, Det, Crit
AST - Det, Crit, SS (Nocturnal) SS, Det, Crit (Diurnal)
SCH - Crit, Det, SS

That being said, I can only think of one class that actually would get use from this stat currently: AST.

AST has the WORST mana management. Ewer pales in comparison to thin air, assize, aether flow, & energy drain.

I could work with 0 piety on any gear and I'd be just fine.

WHM has Thin Air for instances where AOE healing would be used more than once in a 12 second window, Assize for 10% mana recovery every 48 seconds which can be reduced a further.

SCH has a Aetherflow every 30-45 seconds, and energy drain.

Meanwhile, AST has Ewer. If you have a BRD/MCH/RDM/BLM/SMN on your team, call for a shift/refresh and you're golden.

TL;DR - Piety needs a buff

AST spells are inherently less expensive than similar WHM and SCH spells, which mitigates their need for MP restoration. Lucid Dreaming alone is fine for pretty much everything, especially since it can be extended a full 10 seconds longer by Celestial Opposition if so aligned (as WayofTime points out above). I don't consider Ewer much at all unless multiple rezzes have been required and the opportunity happens to present itself; 99% of the time I burn it for Royal Road in 8-man parties or convert it to Minor Arcana.

SpS is fine to prioritize if that's your preference, but I'd consider playing around with your stat distribution to see if your playstyle might benefit more from placing a greater weight in Det and Crit. The math doesn't really support SpS as a stat for healers to purposefully stack; while it can benefit offensive spells, the benefit to healing is limited to HoT effects. Also, the benefit to DPS is somewhat less if your increased SpS runs you too low on MP at any time, as Sebazy describes.

Somewhat back to the original topic, I still think Piety is somewhat garbage and would not recommend that anyone actively stack it.