This is more or less what I was thinking. Armor almost always has been mentioned by other games discussing why they don't have distinctively non-humanoid options. You'd have a hard time customizing armor to fit a moogle, as an example. Even the Pomguard only gets a helm and weapon.
The other concerns is generally whether enough players would choose to play a non-humanoid race over a humanoid race if offered. If only a tiny fraction would end up playing such a race, it's not going to be considered worth developer time.