I'm not sure I can agree fully. Rshamans are still a very capable spec, and although to perform at the level of other healers this tier we have to utilize ourselves to a much higher degree(Although I love the challenge). Shamans went from dropping HR in T14 to barely being able to use it, this in its own can cause player issues due to adaption.
Shamans have mechanical problems, I posted a thread on it and have commented elsewhere on it. But we're not bad and we definitely don't suck. The best thing Shamans can do is provide GC with what he ask for and hope he relates, if for some reason they decide Shamans don't need anything, then we just have to move on and learn how to get better and hope during the next Beta cycle they listen to feedback when it said Riptide/Chaining glyph won't help our mechanical flaws at all.
I think the "barely being able to use HR" thing is a pretty significant exaggeration. At least in 25M, it's more like we have gone from needing to drop HR on CD to still needing to drop it on CD 80%+ of the time, because even though T15 mechanics have removed about 70% of its effectiveness, it still does more for the mana and cast time than any other option you have in your toolkit. Realistically, at least for 25, I don't think much has changed in how you generally need to play (HR/HST/RT on CD, with fillers in between), it's just that the effectiveness/usefulness of that way that you need to play has dropped significantly with no compensation. I don't even necessarily understand the "need to adapt", etc, because really, what is there to adapt to that is different from T14?
-RT and HST should be used on CD obviously.
-HR should still be used on CD (preferably with ULE) if it will hit at least 3 targets for it's duration (or possibly 6+ targets if for 5 seconds or more)
-Glyphed Riptide is still a pretty terrible option that is generally worse than just dealing with the lack of instant casts outside of SWG (except on a fight like H Tortos where there is little effective overheal).
-Outside of that, it's the same as T14 - it's always been single target direct heal or Chain Heal fillers (or maybe Lightning Bolt spam with Telluric Currents glyphed.
I also don't agree with the notion that Resto Shaman have a significantly higher skill cap. I would argue that we have a lower skill cap than Disc Priests, Holy Pallies, Resto Druids and especially Mistweavers. Too much of our output comes from cooldowns and from abilities that should be used on cooldown. It doesn't take much skill to use HR, HST and RT on cooldown, nor does it take much skill to effectively use Ascendance, HTT and SLT. Outside of that, that "filler time" is such an insignificant component of how we actually perform that it doesn't matter that much, and that filler time is really the only place that player skill significantly comes into play. If anything, we are probably the lowest skill/easiest healer to play.