While you are technically correct in the lore sense, modern WHM in Eorzea has a very much saint-like nuisance to it. After white magic was misused and caused widespread disaster, it was once buried away as a forbidden power, only to be later revived by the Padjals and passed down in secret as the power used to guard over the forests. So modern WHM do indeed convey the image of protectors, holy, sacred.
I'd like to see some more variation that perhaps involve a more adventurous image, but I don't think they're entirely off the mark with the current designs.