Machinist, it's the most well designed job ever! It's a selfish damagedealer that can't deal damage! How awesome is that?!

Jokes aside...blackmage i would say, the core rotation of blackmage never changed much and it's still the same concept, switching between ice and fire, as it was in ARR. Proof to me that the design is what it was intended to be and good, since the other jobs changed so much even got completely overhauled but blackmage still is the same selfish damagedealer he was in ARR.