Pixel count increases, all else being equal, are good. The problem is that all else is not equal. Recent pixel count increases have come at the expense of pixe

Pixel count increases, all else being equal, are good. The problem is that all else is not equal. Recent pixel count increases have come at the expense of pixel area, since the total sensor area is not increasing. Thus there are fewer photons per pixel, decreasing the per pixel signal-to-noise ratio.