Having 2 engines go out is such a rarity that it almost never happens. And when it does, it’s usually due to something that would have affected 3 or 4 as well.
ETOPS regulations also ensure (at least for the US) that if one engine does go out somewhere over the ocean, you’ll at least get to land somewhere.
The end of the Cold War made direct two engine flights viable because (a) we could fly over Russia and (b) Russia was nice enough to open up a bunch of airports in the Far East (with money from western airlines) to comply with regulations.
ETOPS regulations also ensure (at least for the US) that if one engine does go out somewhere over the ocean, you’ll at least get to land somewhere.