I like White Mages being more strictly Holy. As is it kind of ate up two different thematics (nature and divine) and because of that it wasn't a great fit. They're two distinct themes and they should be able to stand on their own. While I personally feel like they could have had a nature healer without issue (or a more divine one) others seemed to think that wasn't possible, so this change helps to make it possible.

As for the proposed idea, I'm not sure how I feel about it. Ignoring the elemental aspect which could just be changed, I would like Healers to focus more on healing as opposed to a soft rotation. Expanding the support a White Mage does would be fine, except that I'm not sure how they could do that in a meaningful way. As far as buffs/debuffs go I would want them to focus more on defensive things than offensive too, which isn't really popular but fits White Mage.