Why is BLM getting a buff?

[Verne]

So why not make use of exploiting elemental resistances? Or does that not apply to enemy mobs?

And if it doesn't, who's bright idea was it to not include it in the damage calculations?

This is a design decision that actually makes a lot of sense with the current system. Black Mage was a much different class (not that all weren't) back in 1.xx, where resistances were actually A Thing. Now we have our Big Damage spells, our MP Recovery Spells, and our DoT Spells, all being of different elements, but getting their fair use and having roles to play.

Imagine if it were like 1.xx. You could not cast fire spells on Ifrit. Most of what you did on BLM in 1.xx was Thunder --> Thunder II (and it was not an issue because Ramuh was not around then). We'd also get the shaft if/when they'd have added Shiva, as we would not be able to transition into UI3 effectively. The lack of resistances on enemies, from a game play perspective, makes sense as is.

As an aside, the only thing I do miss from 1.xx is Freeze. God, Freeze used to be so awesome.