The problem with jobs?

[Krotoan]

No bonus damage vs slashing, piercing,etc , elemental weaknesses, no nothing.

This very much used to be a thing and it became far too divisive. Certain jobs used to make mobs weaker to their type of damage and things had elemental weaknesses.. so it's pretty much a matter of the method they tried pulled away from their vision of how the game should be played, I.E. everyone should be able to play the game as whatever they want.