Real air gapping isn't conceptually difficult. It's just a lot of effort and expense (although as far as I can tell, tiny compared to what's involved in buildin

Real air gapping isn't conceptually difficult. It's just a lot of effort and expense (although as far as I can tell, tiny compared to what's involved in building entire new data centres), and adds friction to your operation. (And you also have to have competent, trustworthy employees, as Stuxnet showed us.)