This incredible reliability is the justification for TOPS and ETOPS policy in which suitably qualified aeroplanes with only two jet engines are allowed to fly over an ocean. Before TOPS this is why you see jet aeroplanes with three engines, they don't need three engines to fly, but the regulations required that if two engines fail the plane must get to safety, with TOPS that's no longer required (hence the joke expansion for ETOPS: Engines Turn Or Passengers Swim) and so new planes with three engines didn't make sense.

With piston engines two engines failing is a completely reasonable thing which will sometimes happen to say, a transatlantic flight. In the early days of such travel, the demands are such that all the practical aeroplanes are four engine models anyway, so limping to an abort airfield on two engines was a reasonable strategy if two failed, but once jet engines on passenger planes were a thing, their enormous reliability makes this unnecessary hence TOPS and then ETOPS.

The mentions of TOPS above are a brain misfire. ETOPS was altered repeatedly but it was always named ETOPS, at first allowing 90 minutes, then 120 minutes and eventually 180 minutes of assumed single engine range. A modern twin engine jet can go a long way in 180 minutes at design single engine performance.