Viability of a Spell Speed WHM set up?

[Donjo]

Critiques

So sub-optimal play ended up leading to a victory anyway? Guess we'd better start sending petitions to SE, because the game's obviously too easy.

Until they add Piety to every single piece of casting gear in the game (of level to have it) and consequently remove it as an option in relic customization, it's a secondary stat. Just an odd one that you can dump a free +30 into as you level up.

Oh, okay. What's going on here is that we're operating on different definitions of what different stats are. Here's how I look at the whole picture, for an exact reference.

Main Stat: The stat deemed most important for a particular role. This is illustrated by the stat being present on every piece of gear intended for that role, ie. that role can Need roll on it if it drops in a dungeon.
Tanks: VIT
Healers: MND
Casters: INT
Melee: STR
Ranged/NIN: DEX

Damage Stat: The stat which primarily determines a job's skill potency. The only jobs which have separated Main and Damage Stats are Tanks.
Tanks/Melee: STR
Healers: MND
Casters: INT
Ranged/NIN: DEX

Primary Stat: The subset of stats important enough to roles who use them that not having enough of them will prevent the completion of content.
All Main and Damage Stats, for obvious reasons.
Piety: Not having enough MP leads to being out of MP which leads to death.
Accuracy: Not having enough accuracy leads to misses which leads to not enough DPS.

Secondary Stat: Stats which allow players to nudge their own playstyles in particular directions. While there are combinations which produce superior results over others, they will not make or break one's ability to complete content.
Determination
Critical Hit Rate
Skill Speed
Spell Speed