One thing I saw and found really really cool, having Viera helps give perspective on the body type for lady roes tbh. Saw it comparing two of my alts.
https://img2.finalfantasyxiv.com/f/4...jpg?1561991205
https://img2.finalfantasyxiv.com/f/d...jpg?1561990660
I originally designed my roe with the intention of getting her to look very feminine and very curvy. Frankly with tall and slim Viera of comparable height, it's easier to recognize that the roe is significantly more solid and thickset by comparison. I still plan to mess with outfits for both when I eventually level up (roe will do better with sleeves, a scoop or v-neck, and a leg slot choice) but since part of what I like visually is being able to work with a range of body types I actually think this strengthens existing races as well by making them stand out in new ways. Roe women are no longer simply tall, they're good if you want a stronger or wider build while Viera are more willowy.