Ah, caster jewelry, cloth as BiS for non-cloth wearers, and the infamous "gun as stat stick" debate, we meet again.
In your opinion should a MS/OS pug give priority on MP5 items to healers? For example Sarth 25 drops Wyrmrest Band
https://www.wowhead.com/wotlk/item=40433/wyrmrest-band
41 stam
40 int
32 haste
67 spellpower
20 MP5
Now this first few weeks that's probably a legit upgrade for most any caster. However, if I'm trying to pug in to a run and see that +hit items are going to DPS as a priority, and that spirit items aren't being prioritized to anyone, then if I also see MP5 items going to DPS...I'm joining a different run.
But I definitely see the DPS' point of view as that item has pretty good stats and not a lot of its allocation is spent on MP5. Nor is MP5 worthless to caster DPS.
It makes a difference what question we're asking. If the question is "Is this an upgrade" the answer would be to let everyone roll. But if the question is "Looking at the Tier 7 loot overall, is letting DPS go after +hit and +spirit and +MP5 the best way?" at this time I think the answer is no. As someone that pugs a lot the question I usually ask myself is "Are these loot rules going to make it tough to find good applicants of every role?" which in this case I feel means MP5 to healers.
But if for example there was a gap in itemization and the ring above was one of the only options to caster DPS, I'd feel differently about the situation. Maybe Trial and its 5 bosses has that issue, but the loot table for Naxx is enormous.
Also I'm not gonna sift through 30 specs worth of BiS lists, but if people want to summarize how good spirit is for the different casters I'm willing to listen.