You can't have one class with the same capability as the other classes in their role, who also has access to instant casts on atleast every second spell, high potency cure, instant raise, and a damage buff for all melee and ranged classes, without the other classes in that same category having atleast equal utility.

It's totally illogical, I don't even know how there can be a 6 page thread about it unless it's a cacophany of people agreeing with each other.

The class has more damage, more mobility, more utility, more survivability, and less punishment for screwing up. I play neither and have a vested interested in none of the ranged (magic) damage classes. The situation between rdm, blm and smn is untenable and ridiculous. Even if you accept only 2 or 3 of the above 5 areas are out of balance, that's still an extraordinary imbalance that renders leveling blackmage a waste of time, where even if you are playing it because you enjoy it, you are doing so at the cost of being a detriment to your group.