Isn't that because the twins are designed to a higher standard, due to regulations such as ETOPS? It's not something inherent in two vs four engine designs? I

Isn't that because the twins are designed to a higher standard, due to regulations such as ETOPS? It's not something inherent in two vs four engine designs? I remember when the US Navy was rejecting single engine aircraft, and the F135 had be be proven literally bulletproof before they would even look at the F-35.