If you knock down an email server, you could stand up a parallel server or you could find workarounds. If you knock down a factory floor, there is no real parallel, alternative to a factory floor.  Dane Grace, product manager at Brinqa talks about how the risks to OT carries with it an outsized kinetic response in the real world. For example, what would happen if someone managed to put a botnet on a defibrillator?