In my opinion, the OS should not be updated. Not if important software is running on the machine. That's why we see cash registers still using Windows XP.
Sure, if you test it and see that there is no issue with updating, then you can update if you want. But neither the OS or the hardware or anything else should get any priority over the business-crucial software you are running. Even with hardware failures, the better option is to get older hardware for replacement if newer hardware has compatibility issues.
Sure, if you test it and see that there is no issue with updating, then you can update if you want. But neither the OS or the hardware or anything else should get any priority over the business-crucial software you are running. Even with hardware failures, the better option is to get older hardware for replacement if newer hardware has compatibility issues.