Concerning "Viera hairstyles give them an obscenely large forehead" I would like to analyze it a bit. Is it actually true or is there a separate detail at play here that has been oft ignored in favour of saying the devs have done lazy work specifically on the port of these hairs to Viera? Let's compare the exact same hairstyles with some other races for a moment.
Let's start with a recent addition, Adventure:
These two look exactly the same on Viera as they do on every other race. The female style definitely gives female Vieras a large forehead, but it's not like the female Hyur's forehead is any smaller. Billboard brow all around on this one.
Let's check out the most prolific example, Ponytails:
Again, the Hyur's forehead is just as big as the Viera's. So what gives? I thought it was common knowledge that this was a Viera exclusive problem?
Another one that gets fingers pointed at it a lot: Artoriel's style
This kinda 50s style short one:
Great lengths:
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A short hairstyle, Modern Legend:
With this real visual evidence in mind I posit that hairstyles do not actually look significantly different on Viera. Rather, it is the opposite - Viera base game hairstyles have incredibly low hairlines with widows' peaks in comparison to other races. As a result they also have eyebrows positioned lower on their faces. That's what is different, the visual dichotomy between Viera base game hairstyles and hairstyles ported from other races. They actually look virtually the same on everybody, we're just so used to seeing Viera with extremely low hairlines that seeing them in hair all the other races usually wear gives us the illusion that Vieras have a larger forehead in them when they mostly don't.