What mistake?

Let's take a flat stretch of torque curve (e.g. VW's 2.0T between 2k-4k rpm), where Q is constant. In this stretch, P = Q*x. Sure, as your speed V goes up, x goes up, and P goes up. But what about the accelration A? It stays constant because A = P / V = (Q*x) / (Rw/K*x) = Q *(K/Rw), K being gear ratio and Rw being wheel radius. So great, your engine is making more and more power and acceleration stays constant. Is this what you call "directly connected"?