If I have understood correctly from the forum, the Asian community doesn't fancy the more beast-like looks like the western community tend to use (The Elderscrolls as an example). While "we" go more for the animals with human features "they" go with humans with animal features.
Not sure how much of this that is true or not. Just picking up stuff I read so take it with a grain of salt.
Even though it might have some truth behind it, FFXIV is a world wide MMO with alot of players from around the world. So personally I think it would be foolish to not include stuff that might attract others.
But they have also said that it's due to technical difficulties and all that extra work to re-fit old gear to new models. So sticking with the old human bodies makes it alot easier.
Not to mention all the hairstyles that would not fit (probably) the more beast-like races so they would have to make a whole load of new ones just for 1 new race (to begin with).
I would love to have a big animalistic race. I loved the Charr in Guild Wars 2. Loved them since I first saw them in Guild Wars 1 many many years ago.
I tend to play the biggest, meanest beast/humanoid in most games and go berserk with him in close combat. ^^