This is Sylphie Fallacy #26: "I already encounter Healers who fail and let people die all the time! If you add any additional challenge to FFXIV Healing, it will just make everyone suffer even more! For the good of everyone else, Healing must be so easy that your daily Healer Roulettes can be accomplished by your 6-year-old as a time-out punishment."
If you really have played since beta, then you'll remember that healers had more damage buttons and fewer healing skills in ARR, and yet, somehow, as if by magic, content got cleared. You'll also know that healers with more than two brain cells to rub together should never be casting Cure 1. Ever.
Also, adding more DPS buttons does not make the healing part harder. Sylphie can ignore ten DPS buttons just as easily as she ignores two.
This is Sylphie Fallacy #33: "Pressing more buttons doesn't add difficulty, all you want is the illusion of choice!"
So then let's give every job the healer treatment, then. Let's bake all of BLM's damage into two spells: Fire and Thunder. BLM will do the same DPS it currently does, but all they have to do is the same 2111111 rotation that healers do. No Xenoglossy, no Fire/Ice phases, no Leylines, nada. After all, all those buttons they're pushing is just the "iLlUsIoN oF cHoIcE" right?
Or maybe, just maybe, difficulty in MMO combat is executional, not strategic. Optimal rotations are theorycrafted immediately after an update. Boss strategies are posted on YouTube. If the difficulty in this game were primarily strategic, then people would avoid spoilers and go into every fight blind, but that's not what happens, is it? Your job, no matter what your role is, is to do the fight mechanics without error, while also doing your rotation well enough that your DPS is sufficient to clear the fight before the enrage timer. Now, DPSing as a healer requires you to press two buttons. Which means healing is playing FF14 on easy mode, because the entire "rotational execution" half of the difficulty has been lopped off.