I would argue that air gaps are critical in ICS networks and PLCs because it is an extreme safety risk to push a potentially bad update from offsite without clearing the operator. The major issue will be pushing back against cost pressure from management.
This is already turning into a major problem with IOT devices from supposedly reputable companies i.e. home thermostats that let pipes burst because of a bad or incorrectly pushed update. Now consider if that bad update could instead kill someone.
This is already turning into a major problem with IOT devices from supposedly reputable companies i.e. home thermostats that let pipes burst because of a bad or incorrectly pushed update. Now consider if that bad update could instead kill someone.