Gonna add my answers to the reddit asks here, because I don't do reddit.
What are those spreadsheets y'all are talking about? I suppose it's lost somewhere in the thread, but I missed most of the discussion.

Are you satisfied/dissatisfied with the healers currently? What do you like/dislike about them?
Do you believe the healers could be better/worse? If so, what would make them better/worse?
Gameplay sure could be more deep, but sure could be worse. I have not played any other mmo I can draw comparison to, but I think they're fine as is.

To me, healer is the embodiment of support. The appeal is in keeping your eyes on the team, what they are doing and what woe that is about to befall them, and improvise accordingly.
I dislike that there is rarely any meaningful opportunity to make use of non-heal supportive abilities (cleanse, shield, rescue, mitigation). Please let me use my funny utility, give me something to esuna. Did you know that shields can protect you from knockback and debuffs ? Please give me something to shield people from.


Would you stop playing healer if the healers received a few more offensive spells?
Would you stop playing healer if the healers received a DPS rotation on par with a DPS Job (you will still be expected to attend to all your healing duties while also juggling that rotation)?
If it's just a couple of dumb damage buttons, I'd keep playing, but I wouldn't be thrilled. Phlegma and Chain Stratagem are uninteresting, it's just more clutter for my hotbar.

If "offensive spells" also includes offensive buffs like AST card's system, then I'm all for it. I mean, you could turn Draw and Play into GCDs, and call that a part of yout rotation.

With a full-on rotation on par with tank or dps, I'd be a bit more worried:

As dps, I tend to get tunnel-vision onto my own hotbar, which I think is incompatible with healer duties. As healer, I'm more acutely aware of what individual mobs or party members are doing; being able to play my "rotation" on autopilot while the rest of my brain power is redirected to playing overseer feels like a necessity to me.

There's also the matter of hotbar clutter. For healers, every button is potentially a panick button, that needs to be accessible fast and reliably.
For dps kit, I already struggle to put every action on my hotbar in a place where I can easily reach it when needed; I can't imagine merging a healer's full kit into that. Dropping supportive abilities to make some room is a no go for me.

I think tank is a good example of what I don't want to see healer to become.
They're the class I have the most trouble with when it comes to hotbar clutter, and the only reason I can play them at all is because I merged most of my mitigation into a single macro button.

In short, I could be interested in some form of rotation, but only if it's a supportive rotation, not a selfish dps rotation.