I think the other issue with rooted hair for me (and silicone skin, glass eyes, things of that nature) is when it's not done to perfection, it makes the piece look less like a shrunk-down person and more like a cheap wax mannequin. Or what if those elements are done well, but the others are not? Such premium features create a greater expectation of realism and if the piece doesn't live up to it, it looks worse and less cohesive than a piece which lacks them. This is one case where I believe it's better to aim a bit lower and hit the mark 100% than aim high and miss it.
The risk is even greater with larger collectibles. You'd think bigger is better since it's closer to being lifelike, but it also makes mistakes more obvious. Some of the 1/2-scale "hyper-real" statues look great. Others look fake due to the rooted hair and glass eyes drawing attention to their other shortcomings. I'd be more forgiving of those shortcomings if the hair were sculpted because the quality of the different components would be more level.