SeenItAll
Under a very good many (not all by any means) ETOPS diversons if one makes the choice of going to that field, then there are no other options. I will have to do the old string over the map to come up with an accurate example for you but parts of the Pacific see this.
If one loses an engine, has to descend to the single engine optimum or max range altitude (depending on how your company plans this out) and you fly for a three hours to the divert field, it very well might be the only option at that time. Just look at a place like Wake Island.
That is why so much planning is put into this--to ensure the best possible outcome.