When FFXIV become ARR, character models were changed. Many players did not like the changes to butts.
In addition, individuals have been asking for changes to the character creation screen to have better customization options. Finally, there is the huge issue of Vierra and Hrothgar not being able to wear most headgear.
The hurdle which has prevented most of this from being enacted has been the time and expense it would take to make all of these alterations to the base models.
It seems to me there is an easy workaround already in the game. Gear.
S.E. can provide the player gear which change their characters body. Items such as 2-B's bottoms, Krile's Attire, and Minfilia's Modish Attire show it can be done.
I request that S.E. continue this trend and offer new gear with effects such as better muscle definition, beard stubble, and hairstyles. The sky is the limit for the possibilities.