You misunderstand. The challenge in hair is obviously trying to make it move and look believable. If the hair tech and art is shit (irrespective of what tech it's using), there's not much to save it. But I don't think the hair tech in Witcher 3 even without Hairworks is bad. I think it looks fantastic.
Matted/natural looking hair can be accomplished in Hairworks/TressFX for sure, but it frustrates me when they don't, and the tech simply relies on complex calculations to render more "realistic" strands of hair with physical interaction but the end result is something excessively clean, silky, and oddly unnatural for the setting. The tech is improved, but the implementation isn't always satisfying to me, the Hairworks/TressFX rendering leading to hair that looks too floaty, too clean, and too unnatural despite technically being more impressive.
Which was really the only point I was getting at; Hairworks is impressive tech but I'm not sure I'll use it for stylistic reasons (especially if the performance cost is huge) when the standard hair in Wild Hunt still looks bloody good. I'll tinker when I finally get to play it.