DNC was already a job in FFXI, meaning it was already made in a way to where it wasn't so godly OP. BLU, even in FFXI, was either amazing or borderline useless depending on what you were doing. And a lot of players in these very forums gave pushback at the mere mention of BLU being a normal job, and I was one of them. BLU does not fit a normal job role, can never fit one. The "magic" in playing BLU is finding ways to absolutely break the game systems, to revel in its ability to trivialize things. Turning it into a normal job basically defangs BLU of its magic, and at that point it's just caster #5, with nothing that interesting about it because you're just doing combos like other jobs.