Tbh, I think the problem is that they split the healers into 2 different groups, if white mage has less hp regenerative abilities and potency yet more mitigation tools, along with just a second damage spell aside from misery and dia that would be a complete kit. Most of the games encounter design for healers is rather predictable, so having more mitigation tools or vice versa for barrier healers plus more damage buttons would provide more engagement. Meaning you'll have more proactive tools, more throughput regen tools, and more damage tools. Making it more well rounded, this is kind of why I like sage so much. Its has a bit of everything.