That is a very subjective comment. I mean it would be one thing if you tried both ways with absolute known fish sitting totally stationary, but I can't see anyway you could make that statement otherwise. I can understand the transducer having a non-symmetrical cone pattern, but other then that, I don't see any other issue.
It is one thing to think you see fish on the display, an entirely other issue to actually make them bite. And also understand that any fish finder/depth locator, tries to display a 3D environment on a 2D screen. So even when you see fish on the screen, you have virtually zero knowledge exactly where that fish could be. It could be forward, or rearward or any place in between in the cone pattern. JMHO!