I think that it's also fair to consider the amount of work required versus the reward for doing so. Female Hrothgar would require a lot of work to create and model, and while I'm all for them, it's likely very few players would actually pick them up (see the companion thread to this requesting them, as well as the Eorzean census that shows how rarely played the existing similar races are, female roes and female highlanders)
It would have taken a lot of effort to implement for not much payoff in the form of new or returning players and fantasia sales, especially compared to female Viera.
Conversely male Viera would have the potential to be VERY polarizing, and I can see why they might want to play it safe and just not touch it. It has the potential to be highly popular, but we've seen even within this thread how many different ideas people have had regarding how they would want them to look. For instance, I would prefer them to be based off the highlander model. Others want a build closer to the elezen, and others want them to be the opposite gender dimorphism to the Au Ra with very small and thin males. If you pick one, then you've upset probably two thirds of the player base, and while it will draw press for being the first time we've seen them, it has a very high chance of not getting people to actually play as that sex if it doesn't look how they envisioned it.
So it's safer to tread familiar ground on both instances. Female viera, which we already know what they look like and have been requested for many years, and male Ronso, which we know what they look like and meet the request for a more beastial race.
Is this what I wanted to see? No. I even tried for a while to make the existing Viera models look male, but changed back when I just couldn't eliminate enough of the breasts, and didn't like how many of my glamor items turned into mini skirts, or just couldn't be used at all... and didn't like how all the dialogue and titles referred to me as female. So I too hope that we'll see this finished... I'm just not holding my breath since it's a pretty risky financial decision for Square to do in this game.