- So a lot of games like Witcher 3 have hair works, but there doesn't seem to be much focus on it. Is there a reason for that? I personally feel like realistic hair can be as important as ray tracing to increase realism. 
can AI cores or something be used to make it less taxing on the system ? Similar as DLSS?

adaemus
I totally forgot that was in Witcher 3 until you brought it up.  I wonder if it just became part of the new engines and no one is talking about it separately anymore.

I would think this, or some similar techniques were developed and implemented.

Takes a lot of extra work to add the stuff in for PC, it ended up like Nvidia PhysX and how heavily they pushed it early on (as much as to have dual gpu card with one gpu dedicated to PhysX for the few games that supported it) and it never really caught on even though it was really cool when released. A lot of their proprietary stuff doesn't really catch on very well. No matter how cool or good it is. Hairworks is really good and wish it could be put into more games but if game engines update to have similar physics for hair and fluid that would be the best thing since it can be more refined and implemented easier into games IMO. In a couple of years once we move away from the limitation of the current gen consoles I think we will be where games are finally pushing hardware better than it ever has before. 

I'd felt like something was up with it last time I played