“ Financial systems are inseparably computer systems” I think this is where he goes wrong. The fact that things stop working overnight means that there is some

“ Financial systems are inseparably computer systems” I think this is where he goes wrong. The fact that things stop working overnight means that there is some human intervention required some of the time such that the risk or cost is too great to run continuously. Same thing happens with porting mobile numbers between carriers. Sure telecommunications systems are computer systems but some percentage of cases must require oversight or intervention enough that it’s not viable to run overnight otherwise they’d do it.