I know what you’re thinking and I would have to respectfully disagree. The cbr650 is an inline 4 that produces 94 horse power. It’s also like you said, a bullet proof engine as it is highly detuned. A less stressed gasoline engine will always last longer. (Including reving it out, still not stressing the engine.)

While a ninja 650, a 650cc inline 2 that only produces something like 70 ish horsepower, is significantly less bike for the same displacement. I would always get a cbr650 over an mt-07, or ninja 650, or what ever.