There's a difference between "fine" and "good". Every healer is "fine", but I can't help feel more often than not if I was a different healer I would have an easier time with everything. SCH has to put forth a lot more effort just to achieve a similar result as the other two, and the reward for all that work isn't worth it more often than not. The skill floor wasn't raised enough, and the skill ceiling feels higher than ever, and that's turning off a lot of the lower tier SCHs from the job. I mean, sure, you can say they want an easy job which the SCH isn't, and, to be fair, it never really was. However, to have the effort so high for the reward seem so low is bad design. That's a lot of the complains that MCH and SMN are having, among other things. The other complaint is the clunkiness and how poorly the jobs feel when not at their max level, and SCH is in a similar boat, though it's not nearly as bad.
Edit: Further thoughts: I can only imagine the nerfs to the fairy were to 1) make it less broken in the hands of a good SCH and 2) make it less necessary to control in the hands of a bad one. I mean, good fairy control is the mark of a good SCH, and that's probably where they attempted to rectify the large gap between the skill floor and ceiling. That would be fine if more of the healing burden was put back on the main SCH, which it wasn't, or it was gated behind Aetherflow, which we're far too dependant on now.
