It's more the case that the wider the aperture, the more the thing needs correcting for aberrations. A fixed focal length prime lens is much easier to correct t

It's more the case that the wider the aperture, the more the thing needs correcting for aberrations. A fixed focal length prime lens is much easier to correct than a zoom lens, because all the aberrations can be optimised down in the design. For a zoom lens, the aberrations need to be controlled while parts of the lens are moving around in weird ways. I have a 18-50mm F/2 zoom lens. It's a really nice piece of kit, but I noticed that at the extreme wide end of the zoom range, it has quite catastrophic coma. Zoom lenses are hard.