Former commercial pilot here: we user to be doing IIIC approaches at least 3 times a year.
For the rest, usually below 10.000 feet, there van never be "two heads up", so one pilot is always watching the instruments. Any deviation from expected parameters (airspeed, verticale speed, ils deviation, radio altitude) Will result in an unstabilised approach and thus the execution of missed approach procedures (a go-around).
As mentioned elsewhere, everyone in aviation knows these systems are as insecure as can be.
For the rest, usually below 10.000 feet, there van never be "two heads up", so one pilot is always watching the instruments. Any deviation from expected parameters (airspeed, verticale speed, ils deviation, radio altitude) Will result in an unstabilised approach and thus the execution of missed approach procedures (a go-around).
As mentioned elsewhere, everyone in aviation knows these systems are as insecure as can be.
Edit: forgot to finish a sentence..