Film grain is a part of the film, a bad set-up/transfer can not make it worst. On the other hand a bad digital transfer will make it less apparent. Seeing it is actually the sign of a good transfer. In most cases FG is an artefact of the media and one that gets amplified by each copy that is made (like making a photocopy of a photocopy), but in this case the FG is there on purpose and was the effect that the director was going for. So in this particular instance not having it on the HD disks would have been an even bigger travesty then most.