But they already have to do that (make element weakness minimal for bosses at least).

I will not (ever) be ok if WHM is the main DD for a stone or aero weak boss (and a WHM main DD holy boss should be a gimick boss imo) - BLM should be able to do more damage then a healer. If WHM can be main DD then BLM should be able to be main healer. Its why I keep supporting the zombie spell and holy spells (which are kind of elemental ambivalent) - something that WHM can turn into a higher dps by using zombie debuffs (that take time meaning overall lower, even though the numbers would look nice). Although you can just go without the zombie debuff and give an elemental ambivalent damage source like holy (even if you fight a monster with holy resistance WHM could still cure).


And I know from smaller monsters that are weak to stone that WHM will usually out damage a BLM (while the WHM wasn't DPS geared the BLM was).