OCTA Aus , you have hit the nail on the head , inadvertently of course.
“until you know damn well where the other traffic is.”
You cant . That’s the point . The simplest failure of situational awareness , navigational error , over-transmission or a myriad of other variables and the system fails. There is no third party oversight . Its fail dangerous , pure and simple . Only somebody who has never sat at the holding point in poor weather trying to self-separate from multiple IFR and scud running VFR could make such a naive statement.
The minimum requirement of any port with multiple RPT jet operations is a tower. Simple.
Otherwise you’re just rolling the dice.