NECA has done this with a few Kenner Predators already.
While I haven't seen their actual response to why, I'm pretty sure the chalk it up to "accuracy". As Kenner figures didn't have netting.
Which does make sense, however the Predator sculpts all have netting somewhere, so leaving it unpainted really makes it look off. I doubt anyone would complain if Clan Leader had painted netting. Atleast the figure would look more complete.