The advantage isn't really in that resources can be wasted by adding a feature like garbage collection, but that if you are going to have features like that in

The advantage isn't really in that resources can be wasted by adding a feature like garbage collection, but that if you are going to have features like that in your programs, building it in at the OS level is a better way to go about it, as it aggregates the resulting issues in one place, where it can be better managed(at a whole-system level).