Hair Room really hasn't been improved since it started in Poser 5. So far as I can tell, the only changes have been to make the hair props that come with Poser lower-res, so Poser handles them better.

There's a lot of improvements they could make (Kirwyn and Tiny have done some nice stuff with dynamic hair), but they haven't.

TBH, I think hair is worse in Poser 12. Superfly hair shaders just aren't that great at this point.