It comes down to controllers doing too many shifts, seeing the same thing day in day out, doing the 10 shifts in a row and on day 10
Vb goes at .68 wich he didn't for the last 9 days.
Here, we we have a constant variety so expect unusual stuff (the russians and french are good at that). In aus, 2 big players and tired atcs = people making assumptions. This is the systemic problem your talking about.