I think Blizz needs to seriously look at the healer situation in general. The relative strength of HPS vs. other things has skewed a lot of PvE metas in very uncomfortable ways, both in M+ and in raid. To have Disc + HPal be the go-to in pretty much every WF prog situation (barring a fight or two every now and then where Resto Shaman's Spirit Link Totem is required) for how many expansions now is a bit ridiculous. And even at the lower tiers, the power disparities are glaring.
Part of that, imo, is the fact that healing is conceptually different from DPS in that the actual throughput is only a very superficial metric. While most DPS can indeed be reduced to numbers a lot of the time (barring exceptions like e.g. immunities for certain fight mechanics), HPS is very different because it doesn't actually "fight" anything a lot of the time - it's naturally capped in efficacy by incoming damage, and so without actual damage the HPS is meaningless.
That's where the cooldown problem comes in. Because the powerful CDs available to some healers effectively reduce incoming damage, they actually work on HPS twofold: they reduce incoming damage and so devalue pure HPS throughput; and they provide invisible "pseudo" HPS which further skews the importance of HPS as an overall metric.
This means that secondary factors rise in relative value - including, of course, powerful cooldowns for damage reduction, but also things like damage output. Those carry different weight between M+ and raid (though not as different as some people might think) and are tricky to balance, but over the last couple of patches at least Blizz has barely even attempted to do so. It's not surprising, given that at this point this would require some serious changes to most healing classes that go way beyond tweaking a talent here or there, or adjusting numbers. One would THINK that this was best done during an expansion launch, but alas SL doesn't seem to have been particularly big on class changes...
I'm not even sure how to do things properly at this point, and preserve balance across M+ and Raid - not to mention PvP, which is a whole different story. But SOMETHING should be done. It's not incumbent on the players to solve everything. That is, after all, Blizzard's job and what we pay them for