I was quite honestly ecstatic with the story finally tackling tempering and that someone cared enough to make it their life's mission to revert the process. If anything, it seems like the questline resolves too quickly. An incurable affliction that was commonly solved through execution (that moment in which Thancred offhandedly mentions Ul'dah would put all people we saw being tempered by Ifrit to the sword was one the darkest throughout ARR, imho), suddenly curable with an almost 100% success rate, given enough resources.

I also appreciated how 5.x in general has been slowly bringing "beastmen" into the fold as sentient beings worthy of respect. I 100% do not trust any Eorzean nation to not betray them again, given how racist they all are, but it's very nice that the narrative finally addresses the issue with some degree of attention.