It’s super understandable if there is only 1 skin, or maybe a few skins for different covenants, but if you let people make their own stuff, they’re gonna want to customize it a little bit.
There’s a special set for each armor type from Torghast that’s gotten from the legendaries. There’s I think six color variants for each one. I’m not sure if details on that are out or not, but it looks like there’s some customization there.
In a recent interview it was said that getting these sets is a long term expansion goal and not something that’ll be done all in 9.0.