Perhaps the 'per flight' risk in the subject of this discussion was calculated as being low and that is why they decided to 'push on'. The data and engineering judgement so far (EK this incident of push on and SQ return) indicates there is not yet a consistent set of ground rules.
I'm not convinced that we need a rule, although it might quiet down the after incident challenges.
Too many what-ifs that are best handled today by pilots considering their resources both on-the-ground and in-the air.
then just to prepare for deep thinking arguments, why do we need an EROPs rule ? Has it saved anything ?
As you might suspect I see any diversion or air-turn-back as an increased risk as well as continuing.