Actually, Pandarens are the ones that have been the most up to date ones for years compared to the others, even more closer to the model updates received in wod. Worgens at the time actually were more in line with the Draenei and Blood elves if you want to be more specific. While Pandarens used a much more enhanced skeleton and texture mesh, which they still use today, worgens/goblins you can literally see the triangles on the models and limitation on them in the previous model before 8.2.5. Female worgens specifically had some extremely wonky stuff going on. Heck, the alpha worgen model had way more going on with it before they scrapped it and gave us a completely rushed version of the model literally weeks before the expansion hit. We then had to live with it for 10 years. The moment the other races received their updated models, right away you could see the flaws, even more so, that the worgen models had.
Also think of it this way, you compare how much NEW stuff Goblins got, and then see how little Worgens got in comparison. Keep in mind, we both got released/updated at the exact same time:
Skin color
Hair color
Eye color
Hair style
Ear shapes
Ear piercings
Nose shapes
Nose piercings
Chin shapes
Now compare that to worgens:
Fur color
Eye color
If you’re a DK like me:
Fur color
That’s literally all we got. Not even anything unique, just recolors of things we already had. All we’re asking for is more options.