It's the multiple DoTs and Ruin 4 that are the main things making me say, "Jeez". There's just too much HW/SB SCH (perhaps ACN) incorporated into that kit, and just feels like a blast to the past. But as I said before, I understand that this is a ShB rework, and not really a rework going forward. Nothing wrong with having some fun with some ideas, and there is some stuff in that kit that I really like.
However, the rework I envision nukes probably about 70% of that kit. They would obviously retain the bare essentials for a barrier healer, and still have Lily; I don't even know if they would still have Aetherflow after I cocoon it. At least not in its current state. I would introduce entirely new mechanics to this job that would likely involve the SCH getting something when/if their shields are broken. Shields that release a heal when broken (think a less potent version of excog, but with mitigation tied to it) can most certainly be a thing as well. The Fey gauge would get reworked as well, I am just not sure how this resource will be built or spent. I just know that I would like the skills tied to it to be somehow linked to Lily, and Lily would no longer function as a pet, but a familiar.
Of course they would get some damage abilities. Anywhere from 6-8 of them AAMOF, and they would be very satisfying to use. One such ability I thought of is a DoT that the SCH applies and after inflicting an enemy with it they can also increase the potency of damage it does up to a max. While I know Yoshi leaned towards not giving healers this kind of responsibility it actually isn't a rotation. It is simply a mech where the SCH doesn't just cast a DoT and forget about it until the timer is about to expire; they can actually increase its potency by casting it again while the enemy is inflicted with it; or augmenting it somehow to give it that effect.
That is how I am thinking when it comes to SCH changes. I want absolutely nothing to do with SCH in its current or previous states. So long as they retain their fairy and shields, their identity remains intact.