NM are simply a sort of grind... all the open world content that people ask for can be source of grief and unfair... it's why they have take it out. people see it from FF14 or FF11 optic.. i see it like someone that have seen the worst possible with game like Lineage 2 that was at the start mostly open world content only. some Guild was simply blocking entire area and forbidde the acces to it.
indeed in FF14 no pvp, but it's still possible to overcamp a boss and make it unavailable for most person. more important, people with the best connection will get the loot all the time and it will create what we had in FF14, farming of NM for sell stuff. not because you need it, simply for sell it.

NM is a No-Go totally.