The argument against adding it to this roulette, yes. At least part of the Coils is more difficult than the NMs - to a level that you'd simple see people drop out of the instance once they see Nael.
Personally I wouldnt mind added roulettes that include the more difficult content, like Ex-primals or Savage duties, but they dont mix well with easier content - just look at the mentor roulette and people who drop out of it when they get an Ex-primal instead of an easy dungeon or guildhest.
