Not true, actually. It provides decent buffs. But it's not the most urgent to change.
Highest priority is, in this order in my perspective:
1. Ninja due to high abandon rate of players upon SHB launch.
2. healers.
3. Summoner and Samurai due to Summoner having some clunky mechanics that are unenjoyable and lack of damage for its complexity, and Samurai due to doing less than Monk and Dragoon despite both of those providing support and buffs to party
4. Machinist due to lack of damage over Bard which has, say it with me, more support despite Machinist not giving any.
5. Dancer to buff its personal damage. The buffs it gives seem to be particularly well balanced.
6. Red Mage needs a little bit better damage to compete with the other two of its role.
7. Monk maybe needs a nerf, but imo let's just bring classes up to it instead of nerfing. If this was a competitive game I wouldn't be saying that.
that being said, no class is in urgent urgent strides like ARR bard where you couldn't clear content with a bard period, so none are like "FIX IMMEDIATELY"
Edit: Also, usually they save new job changes for a little later. At least that's my understanding, so that's why dancer is a little lower.