VL, that is a valid point only if your world of possible dangerous outcomes is blinkered to the case of an engine failure during the few seconds of takeoff or landing when safe OEI flight is not assured - and even with PC2E there is no engine failure accountability except possibly for an idealised perfect offshore installation which unfortunately doesn't exist.
In the real world there are many more dangerous outcomes as demonstrated by the fact that engine failure during exposure time has never happened in the entire history of the N Sea, whilst we have found plenty of other ways to crash. If you take a look at overall safety, operating with low fuel states to achieve PC2e mass could result in an overall reduction in safety and that is why the UK operators (not EC) preferred not to implement PC2E. However PC 2DLE is a reasonable compromise that raises crew awareness of exposure and ensures that the aircraft are not operated with an unduly long exposure time.