> why can't they design physical safety relays/cutoffs? They can and they do. Or at least "they" used to. Nowadays such safety devices are very often software

> why can't they design physical safety relays/cutoffs? They can and they do. Or at least "they" used to. Nowadays such safety devices are very often software enabled. Because it's cheap and also because it checks a box on the marketing brochure that every customer wants: "Software upgradability for lower maintenance cost and reduced down time." Oh the irony.