The Norwegian ships are some of the ones mentioned in the article as having been built to lower, “commercial” survivabilty standards. Indeed, from some reports the Norwegian variants deliberately removed some compartmentalization and battle survivabilty for more crew comforts.
Okay but the LCS’ were originally fully commercial ship designs adapted for USN work so perhaps that could be acceptable. Adaptation seems to be okay. For example the USCG National Security Cutters have no - zero - vertical launch cells yet it’s still in consideration. Surely the hull would have to be heavily modified to add some unless this is purely an ASW vessel.