I think once Mechagnomes, aka the kitchen sink, became playable, they figured what the hell.
That or they realized the only actual new races among the allied races were vulpera and figured what the hell.
Or they realized 10% shorter and wider humans, cyborg-gnomes, moose antlers, different skin colors, tattoos, 20% bigger elves, good posture now then more diverse human appearances in Shadowlands… they took another look at blue eyes and figured what the hell. That might be too sensible though. My money’s on board of directors/shareholders telling them just do it.