It still seems to me that, however legal and FAA approved it might be, training for IIMC in an environment where visual cues are still available (foggles) compared to proper simulator or best of all, actual cloud - is just paper-safety and could go a long way to explaining why there are so many IIMC accidents amongst professional pilots.
I finished a NVG sortie last night by pulling up into cloud and flying an ILS - I was thinking at the time that only years of proper training and constant practice have allowed me to do that that in complete confidence and safety - finding yourself in that environment when you haven't been properly prepared is just relying on luck.