Not to mention how often things will effectively be set in stone once installed in the plant. How many utterly mission critical e.g. CNC machines are run by a

Not to mention how often things will effectively be set in stone once installed in the plant. How many utterly mission critical e.g. CNC machines are run by a miraculously still functional Gateway desktop running Windows 98 Plus, camouflaged under a few decade's accumulation of rusty shavings from the nearby lathe?