Computers are just machines: they’re bundles of transitors, resistors, electricity and nothing more, right?
Try removing every personal setting and application from a computer you’ve been using for a long period of time. There’s lots of backing up, ftping, uninstalling, deleting, and then all the settings on everything have to be reset. It’s a lot harder than it sounds. I wish it were as easy as a “remove me” button somewhere in the control panel.