Transparent materials don't look that good.

[Mittens]

@Braindrain85;168006

Yes, this is a real problem. Take hair for example. If I use masked, the material looks fairly good… except the ugly edges of course. But if I switch the very same material to translucent, all the beautiful shading gets lost and the z-sorting seems to bug out:

It is a serious flaw in an otherwise stunning engine.

^^^ This.
I just tried adding some hair to my otherwise very realistic characters today.
As expected, the masked hair looks nasty and clumpy but then transparent hair is just… yea, surprisingly not even slightly viable :S