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They eliminate propeller torque as a reason for the aircraft to have a critical engine.

When a plane has two engines, the one that will most affect the plane's handling if it quits is called the critical engine. If a twin loses one engine in flight, the plane will turn toward that engine. But in a critical-engine situation, the plane will turn more sharply toward one side. On a clockwise-prop plane the port engine is critical; the starboard engine is critical on a counterclockwise-prop plane.

This doesn't necessarily mean the plane doesn't have a critical engine. A plane might have one hydraulic pump. If the engine running it dies, you're going to have to strong-arm the plane back to the ground.

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