That's why it was taught as a business case, because it forces you to look at the requirements for switching and evaluate the cost/benefit of the action. Even

That's why it was taught as a business case, because it forces you to look at the requirements for switching and evaluate the cost/benefit of the action. Even passenger jets still use floppy disks. AFAIK Zara did update their POS system later though, to be more compatible with payment device hardware.