ANFI
It's an interesting discussion of where to invest. My subjective experience is two engines are better than one and yes it made a difference on more than one occasion - including an airliner as I recall over the ocean...
Where money gets invested is very complex but I disagree with your premise that you can't have it all because at the end of the day that's the goal - you have it all - anything less these days is not acceptable. Especially when your flying 400 km over the Arctic Ocean with limited options. Outside of aviation there seems to be no tolerance for risk exposure, you have to have it all.