Why does White Mage feel so bland?

[Selli]

most healers play white mage, and that's not deniable given the simplicity of the class.

1) CNJ/WHM is the only healing class available at level 1. SCH is unlocked at level 30 and AST requires you to have a level 50+ that has completed 2.55
2) You need to get WHM to level 34 to get Stoneskin, which is needed on both the other healing classes as well as PLD.
3) This game has the ability to level multiple classes/jobs on one character.

I missed the letter myself (so forgive the ignorance, those who have seen it and have more context about the photo than I), but any of those 3 things can skew the numbers if not taken into consideration. The picture has no indication of this, so I'm just going to assume they have not. [EDIT] Even if this only includes jobs that are at level 60, I have all 3 healers at 60 myself, but I only ever play 2.