Terrible game design at its finest. Overtuned, untested, bugged mess that M+ is...
Everyone being too smirky and arguing over first or last boss being very difficult. Those are at least "possible" if doing the mechanics absolutely right even if it means fight takes longer.Try doing Naraxas without any Poison dispel in the group, or even with just one. Toxic Retch + Hurling Rocks combo even on Fortified is deadly and on Tyrannical, this boss can literally break your group in high keys without poison dispels.