I would like to point at one crucial point

When we refer to a job utility, it is important to differentiate what the job brings from what the role brings.

Taking Hyo's bard example,
Palisade as well as TP/MP refresh are "role" utility. Which mean that these buff will be brought also by the MCH as he's part of the "range" role.

So it is wrong to say "BLM" brings no utility as they bring Mana Shift, Addle and Apocastase as these are utility skills part of the Caster role.
However it is true to say that the job itself (out of the role utility skills) brings no "unique utility"making the BLM the least supportive caster dps. (Addle and Apocastase are still quite potent skill imo)