"The issue with the Viera is that, if you look at them, they're basically humanoid save for their long rabbit ears and their heels. We already have a mostly humanoid race with animal ears in the Mi'qote. When we looked at those initial Viera concepts, it just seemed like a Mi'qote with bunny ears instead of cat ears. It simply wasn't different enough. Especially when we did the male designs… they didn't look beastly enough, they were just a little too cute. We wanted to make something that was original to the Final Fantasy series, and to do that, we decided to step away from the Viera.
I was actually strongly against showing the Viera concept art at the event we unveiled the Au Ra at. I knew that people would be like “why didn't you include them?!” [laughs] We feel we have a good thing with the Au Ra, though. If you don't like them, though, let us know and we'll take it into consideration with the next race we bring in."
From:
https://www.animenewsnetwork.com/the...n-sense/.91021
I think its also worth noting that he didn't want to add Viera either yet here we are several years later.
However, I feel like I'm missing another interview that touches base with this.
Edit: Person above me found it.