This mentality needs to stop...yoshiP already addressed why there is no Male Viera. They didn't have the resources or time for it - IE they were probably gonna do it... but they also wanted to cater to the demand of a Beast Race. So they made 2 races instead of 1, but only had enough time for 1 gender of both. They also did this because it might be the last time they could make any new races because of the amount of time and resources it takes to make them in the fist place...not to mention the time it takes to fit the thousands of Gear Pieces to the models. Adding in the Hrothgar was also a move to give a much more Diverse option in making an avatar...since its the Only Playable Beast Race.
Also.....Monster Hunter World is a Newer and Much Different game with a much different game Engine. Comparing FFXIV to MHW is kind of weird.