One would batch arrivals, just as you batch departures. In the morning at YBBN, if you batch DEP, then in 10 mins, you could have 10 DEP with div departure, in another 10 min, 8 ARR. If you blend DEP/ARR with the heavies, the spacing will get you far fewer movements.
This gives ac less time in terminal airspace (heavy fuel burn) and less taxi time for ac in DEP...
push 'em back, and let 'em go....