Really interesting, I simply never thought about it, but now that you mention it, and elds description of it, it makes perfect sense. I always marvelled at it the hair in FF as well, and ALWAYS wondered why they never appeared to have sorting issues!
I marvel at how this is used in FF games, to date I have seen few developers bold enough / game enough to even try to pull off female hairstyles such as: Its just so nice and soft compared to snow's hair in this, which actually looks alot harder, almost straight 1 bit: