Because that cruft has grown up in service of a timesharing model of computation that no longer holds. Why does my phone have a root user? Why do I have to esca

Because that cruft has grown up in service of a timesharing model of computation that no longer holds. Why does my phone have a root user? Why do I have to escalate privileges to bind to ports < 1000? Why am I context switching at all? I think it's a mistake to conflate path dependence and correctness.