Choice to these people is asking for the same car in a different colour.
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So based on your answer, i assure you that some people don't care about their look, either mismatching things or being too much coloured. Because it's their fun and their choice, there freedom.
Also based on what you said why can't we play the tribe races then ? Be logic : take a look at the tribes, and then at playable races. Dwarves, Seeks, Nu Mouhs, Vangaas and other things would be more into the Tribe vibe for future update than becoming a new playable race. See the evolution of thoses races between each FF.
The answer is: because the devs said so, its all well and good saying why isn't this a thing, but it's down to developer choice. it could be totally possible to play as beast tribes within the scope of MMOs, but the devs just haven't made it a thing, I'm sure CUTS3R and myself and many others would be totally fine with playable beast tribe races, they are intelligent to the same level as other races, and we have many allies among beast tribes (hell, the Vath has an "adventurers guild") and it would make sense within the lore of the echo.
The reason we don't have it because of city state lore. The beast tribes are enemies of the city states and the WoL is a key part of the politics of the city states, Au'ra is toeing the line with Ishgard, but to have a sahagin doing politics with Merlwyb would make no sense in the story, and that is why we won't see that. A beast-like race is completely different though, as it has no existing reputation or conflict with the city states
img1.wikia.nocookie.net/__cb20090814185049/finalfantasy/images/f/f3/GiottlucaDS.png
Here we have one iteration of Dwarves in Final Fantasy. This version would likely be relegated to beast tribe status, and their builder schtick is similar to what goblins are.
static.tvtropes.org/pmwiki/pub/images/After_Luca_9700
This, however, is also a Dwarf. A short, chubby, and adorable young lady.
They aren't "ugly" by any means. They could easily come from Radz-at-han, Thavnair, or Xelvatol. And honestly, a legitimate "fat" body option would be a welcome edition for a large chunk of players.
And dear God, I need some bearded men as much as the next person. Come on Japan. Bearded men know how to wash themselves! Give the guys the OPTION!
Something you can create in Dark Souls III, a Japanese made game.
http://i.imgur.com/zD89nR3.jpg