So is the moral of the story is to build an entire OS like erlang's actor model? Doesn't that work by using lightweight threads and messaging passing between th

So is the moral of the story is to build an entire OS like erlang's actor model? Doesn't that work by using lightweight threads and messaging passing between them. The supervisor gives each thread a certain amount of time to run and then puts the current thread on the back burner while the next thread runs for it's allotted time. I remember hearing it in an erlang talk by Joe Armstrong on Youtube. I can't remember which one though.