But I wouldn't wish to expose my PAX and aircraft to the additional flight time on one engine in case something were to happen to the other one. That's where the probability and risk enter. I'd possibly be facing severe penalty if my judgement was wrong.
If your EDTO area of operation was 1300nm on your aircraft (180mins OEI)and you were flying between two island EDTO alternates 2599nm apart with no others around would you go?
What about if you had a 150kt crosswind all the way there or back?
Is there a difference, legally? Operationally?