I think demi transformation is still pretty niche. Having the features of other species and the cuteness that comes with fur, feathers, synthetic material, etc, but human skin. Great for those who like subtle changes, not as fun for those who obsess over anatomical accuracy.
It's especially great for reality warp scenarios (humans now evolve from a different ancestor) or infections (the earlier changes are a lot easier to hide with clothing). Sometimes the texture of a TF victim's natural hair changes to something closer to matching their related species (bristly mohawks for hyenas or abundant curly hair for sheeple).