I would like to preface this by stating that I am not an end game raider. I haven't done the current raid tier nor have I even stepped foot in Ultimate content. I am here merely as a WHM player that has been here since ARR to express my concerns about my class and how I believe it can be improved upon. My goal with this post is to improve the QoL for WHM as a whole, while also improving upon its current toolkit in a way that will allow WHM to remain a powerful Healer choice for end game (and as I said, I'm not a Raider so please take my suggestions with a grain of salt).
1st off, rework and reintroduce old skills as low level version of our existing toolkit. Since the trait system can be utilized to enhance these skills at the appropriate levels, this not only prevents the issue of button bloat but it also enforces good learning habits for players to take with them as they level up the job. Skills like Fluid Aura, Stoneskin and Divine Seal (or Largesse for those of you that joined when SB was released) could all be reworked and reintroduced to be the low level version of Aqua Veil, Divine Benison and Temperance respectfully so that players learning to play with WHM are given their toolkits at a much earlier stage and learn how to handle them each as time goes on with each upgrade coming more naturally in the leveling process instead of just being handed new tools at the tail end of leveling and having a harder time of it because they haven't learned how to properly manage them at lower levels.
Secondly, the return of an AoE DoT. This is more a suggestion applicable to all healers really than simply WHM alone but I am suggesting just to complete our "rotation". If Healers can, at bare minimum, maintain a Single Target Nuke and Dot, why should our AoE rotation be any different? If the concern is that it will increase healer damage too much, couldn't they simply make the AoE DoT apply the same type of DoT as the single target version in a similar fashion to Thunder on BLM so as to prevent that from happening? This not only gives healers something else to do in AoE trash pulls apart from their AoE nuke skill but it alleviates the burden of these pulls by allowing the mobs to die quicker as well since now Healers won't have to manually apply their DoT on each individual target.
To my next point, I would like to address the Lily system. With the changes to cast times on our attack spells as well as the increase in potency coming in EW, the Lily system is currently looking to become obsolete just when it finally got a solid foundation in ShB. To address this issue, I would to expand the Lily System to remain relevant for WHM with the introduction of 2 new Afflatus abilities, Afflatus Reminiscence and Afflatus Tenacity as Lily Equivalent versions of Medica 2 and Cure 3 respectively. These abilities would cost 2 Lilies, as opposed to the single Lily cost of Afflatus Solace/Rapture so as to not only prevent overshadowing those skills but to also grant WHM a much less punishing usage of the Lily system by speeding up the process in utilizing Afflatus Misery at a much lower DPS discrepancy than it currently is. Since the current reason that WHM lacks raid utility is because they offer the most damage out of healers, which might no longer be true with the introduction of SGE, WHM needs more damage to remain relevant in the end game scene. With these 2 new skills, the damage lost by utilizing Lily Skills is greatly diminished and WHM can get that extra damage it so desperately needs.
On the topic of the Lily System, I would also advocate for Afflatus Rapture to be moved to level 58 so as to both be closer to acquisition as Solace as well as make up for the missing skill gap that is currently there, with Afflatus Reminiscence and/or Tenacity taking up the current level slot of 76 so as to prevent that gap from occurring.
Now, on to a more controversial topic, Lilybell and the Thin Air nerf. Since we don't really know what end game for EW is going to look like, its hard to gauge just how useful Lilybell is going to be but at a cursory glance, the skill is.....lacking. While the max potency of the skill is extraordinarily high, the condition of activation is less than ideal; Coupling the heal to the WHM taking damage is bound to cause problems rather than resolve them. The best times to utilize such a skill is on multi-hit Raid damage attacks, such as J-waves in TEA, but there hasn't been many instances that would require such an ability and Cure 3 was our answer to those moments when they did pop up but with the nerf to Thin Air making Cure 3 spam much more costly to do, it feels like Lilybell is meant to make up for it but really doesn't because as an oGCD ability, it doesn't gain the benefits of skills that boost the healing potency of abilities, such as Temperance or PI. A single Cure 3 with PI can heal for almost as much as 2 tics of Lilybell, meaning that we'd still have to utilize our GCD to healing in order to make up for that lower healing value so it kind of defeats the purpose. To make it even worse is that any wasted stacks left on Lilybell upon finishing its duration only restore half the potency. This does NOT warrant a 3 minute CD as it currently stands nor does it make up for the nerf to Thin Air.
So, I would like to suggest that Lilybell be added to the Lily System as well at a cost of 3 Lilies, a reduced CD of 90 seconds so that its technically available more often than 3 minutes, that it restores MP for the WHM as a secondary Lucid Dreaming and that the Lilybell heals on a fixed interval similarly to a Regen, going off every few seconds instead of relying on the WHM to be hit to proc. Now, I know the unlikelihood of a WHM holding on to their Lilies in Ultimate or even Savage content to even warrant saving them for something as meh as Lilybell but hear me out. By turning Lilybell into a GCD ability via the Lily System, it will now benefit from more of WHM's toolkit, namely Temperance and PI, meaning that the heal can become even more potent than what is currently being offered. Not only that, but costing 3 Lilies means that Afflatus Misery becomes a DPS gain for WHM since Lilybell will be able to grant instant access to the skill on its own. Finally, by adding the secondary MP restore to it, WHM can remain a strong progression healer due to having another means of getting more MP from its toolkit.
I know these suggestions won't address all of WHM's pain points but I hope they at least get some more ideas and talks going in regards to the future of WHM. Please feel free to criticize as I am very interested in discussing alternative opinions on the matter.