If a technical systems fails / malfunctions in circumstances leading to a hazardous situation, and where comparable systems / aircraft provide sufficient mitigation against this hazard, then irrespective of human performance, assumed or otherwise, then the deficient technical system should be corrected.
The debate in the above is with what is assumed to be hazardous.
The technical outcome of an accident is objective fact; but the assessment of human performance either with hindsight or expectation in future situations is always subjective, uncertain.
‘Precautionary Principle’ … defines actions on issues considered to be uncertain, for instance applied in assessing risk …
"… caution practised in the context of uncertainty" …