Is there a case for standardised displaced thresholds at destinations where there are no safe undershoot options, or
where there are difficulties assessing height visualy ( over water)?
What exactly is that you are looking for? It was day VMC condition ...not the scenario for a black-hole approach.
The Black Hole Approach: Don't Get Sucked In!
where there are difficulties assessing height visualy ( over water)?
Even without a PAPI (and it was not the case) you can assess if you are on a correct glide path! I am expecting that for a 9000 hours pilot!
Excuses are acceptable only in case of fatigue!
In this instance, if the aircraft had been 2-3 feet lower, most of passengers would have been lost.
It was a training flight ... the safety margins should be increased ... 2-3 feet lower it would have been 2-3 feet well below the glide than they were already which it was already unacceptable especially if you do not have energy (speed in this case) to counterbalance you distraction.
But considering what kind of stressed stimulations the structure of the 777 went under ... wow she is a pretty safe airplane ...