That's not flawed reasoning in and of itself. It's just an unrealistic expectation passed off as a realistic one. It implies that capturingb x% of the market sh

That's not flawed reasoning in and of itself. It's just an unrealistic expectation passed off as a realistic one. It implies that capturingb x% of the market share is only x% as difficult as capturing all of it. The inverse of your argument is an actual logical fallacy, known as the continuum fallacy. Or, "if we can't do it all today, and tomorrow is the same as today, we will never be able to do it."