Ah ! Blame the equipment which is only as good as the information provided by the operators.
The system cannot cause overloads, but interpretation of the data can, incorrect data being input into it can, slot busting can, the 30 minute window afforded to EOBT's can, controller ability can, traffic complexity can, pilot error can, emergencies can etc etc....most of those have human interaction !!
The reason it may amaze others is because of the equipment they have to work with in many cases being inferior.
To state that at least 50% of overloads are caused by it at Swanwick is absolute garbage and you know it. If that was the case it would have been withdrawn from operational use a long long time ago. I suggest you get yourself educated before talking such utter nonsense.