Disagree.
Blm is the standard wizard of most rpg games and a core job. It doesnt make sense to make it a advangte difficulty class. Esspecialy, when he can be allready hard enough.

At the start has he non of his insta cast spell. Mean: in solo Story fights are the enemie allways on you and can interupt your casting. In addition has he the longest casting time. That makes quest where you have to be fast dificult.

In addition is he the only class left, where holding up timers is still a core mechanic, that ruin your skill flow, if you are to slow. The timer in combination of long casting time and movement intensive bosses, can allready be to much for some people. The only other timers of other classes are eather dots or burst modes.
It would make more sense, to make the blm easier, as the core wizard, and make other caster the advangted Version. Because, they are classes, that you obtain with higher lvl.