If our current damage is fine, then our utility must be crucial to raid performance in, especially, heroic modes.
It's not. The hybrid tax is long gone and pures have been given a level of utility that often equals that of, certainly, melee hybrids.
The only fights where I actually feel like my 'utility' makes a dent, are those Enrage timer kills with less than 5 seconds on the timer (Stormlash), and fights like Elegon/Wind Lord HC where I can abuse Ancestral Guidance.
Overall, I feel like Warlock portals, Healthstones and Combat res offer a lot more reliable utility, applicable to more situations, than what I offer on my Elemental Shaman in the form of an underwhelming healing cooldown, a 30min ankh, and the (imo) overrated Stormlash.
And all of these are utility spells. You make the distinction with buffs, which does not hold. Buffs are also utility. In my opinion utility is anything but damage to a DPS, healing to a Healer or threat-generating abilities to a Tank, that benefit more than one person (otherwise it's simply a personal cooldown, which in itself is also a form of contingent utility, like Dispersion to soak sparks). If you have a raid comp that does not have an Elemental Shaman/Shadow Priest/Balance Druid, then the Hunter who takes a Sporebat to the raid offers some utility.
I've checked some of your logs, and while you're performing great as Elemental, I noticed that in your latest logged raids some of the players you're playing with are not performing on the same level within their own class/spec combination as you are within the Elemental Shaman population. I'm not going to single out anything, but when you're playing with a Rogue, Hunter, Mage and Warlock in your 10m raid comp (my raid comp), who are all performing at the 90th percentile consistently, it becomes glaringly obvious that our damage lacks behind far too much and certainly isn't in proportion to the added utility we bring over those 4 pures. At least, that's my opinion.