That's why it is necessary, where practicable, to have a check system in place. The simpler the better.
How far back in the thread have you gone?. There were many check systems in place, including the mandatory requirements to be met before any descent below MSA, these have all been raised many times. The shifting of the waypoint in itself had nothing to do with the cause of the disaster.
1. Vis 20 km plus.
2. No snow shower in area.
3. Avoid Mt Erebus area by operating in an arc from 120 degree Grid to 270 degree Grid from McMurdo Field, within 20 nm of TACAN CH 29.
4. Descent to be coordinated with local radar control as they may have other traffic in the area.
You will note that this is the ONLY let down procedure approved by the Company and the CAA. The crew was aware of this requirement as a copy of the memorandum was recovered from the cockpit wreckage.