I wouldn't call it a red herring, the actual Queen from the past who was imbued with the blade's power has a body shape that is clearly not a reg Femroe. Given how things are it just makes more sense to have them place hold.
Basically, given that all the non-Lala females are based on Middie Females, you have to look at what makes Femroe different to the others. What makes them stand out different bodywise is not only being the buffest and tallest but also having wider shoulders and waist compared to the shoulder/ hip/ waist ratios of the others (and fat wrist cause ... reasons? IDK, to match the dudes?) and being given the tiggest BITS to counter-act that buff if people so please.
So if you take away the buffness, making them slim ... and make the shoulders and waist narrower so that the shoulders arnt wider than the hips and you make them shorter (all of which is seen in the art work and Queen model) you're gonna legit land on some body shape that looks more like that of a Viera or Highlander.
I know Femroe are not seen as conventionally attractive (Elezen's problems were before ARR. They're not ugly imo but they're stuck with some proportion and animation problems) but the devs actually do try to make PC females attractive/ cute. It's never really been a concern of mine that they wouldn't look "pretty" so the art didn't shock me at all.