Coming off the Witcher 3 one of the things that just really stuck out was just how well the hair was done the hair and beard was done in the game, even if you didn't use the nvidia hairworks the long-hair was animated well enough that it looked like hair , even Geralts beard moved and looked a lot more like "hair" then the usual flat "squigglies" that many games use for facial hair in their games. It didn't look like your normal "bolted on" pile of playdough that most games end up looking like in regards to the hair and beards.
I'd love to see fallout 4 at least have basic animations for the longer hair styles that make the hair look more like hair and not like just some static unmoveable blob stuck on your head.