I assume complexity and cost? The new Mercruiser 600 HP outboards do have a second gear that’s like an overdrive and improves efficiency. They also have a fixed upper and the lower drive portion rotates to steer, which is pretty cool.
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‘07 Mazda RX8-8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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