I think it's the game holding back BLM. Can't really have a proper resistances system when you have to have a "rotation" that limits your ability to cast freely like you could in FFXI.
But ARR primal weapons did had +resistance in their stats, which made the fight a little easier for HM/Ex back then.
FFXI or any other FF before...
but i think SE did the right thing , there are a lot of skills that are elemental based , as brd flaming arrow and Windbite...., Conjurer will be useless against earth resist bosses , ninja for thunder will take a hit , and water inmune would make Trick attack useless.
Smn same , forced to use ifrit on wind inmune , and garuda on fire inmune ...
Elemental wheel works only when u have access to spell of every element that only do dmg , if u a element is attached to some kind of utility ugh....
Imagine Piercing inmune bosses....drg , brd and mch will be useless , slashing? lol nin ,and tanks out....