It's a very complicated matter, not just a lack of time and resources.
- The developers wanted to implement Hrothgar, but felt obligated to put Viera in by fan demand.
- There was no frame of reference for male Viera, and they didn't want to disappoint anyone. (You'll notice on this board some people want them to have a similar physique to the females, while others want them to be short and cute in an inversion of the Au Ra sexual dimorphism dynamic.)
- While the fan demand for something like the Hrothgar was far lower in volume than Viera (see: the thread requesting male Viera has over six times the views the one requesting female Hrothgar... because it's about gender equity, right?), the devs wanted to put them in for the sake of diversity.
- Given it's already a massive undertaking to implement new races and will only get harder as time goes on, they considered this a last chance moment.
So. It was intended to be a compromise between their creative vision and fan demand. Unfortunately, people had hyped themselves up way too much over the Viera... leading to this unfortunate outcome. (It's true that there is likely a silent majority who are understanding and accepting of this, but as the OP said, this has brought out the worst in [some] people.)