Krieghoff is "sighting" the rifles for old guys with sight problems who will likely be putting a scope on it, anyway.

Yes - longer sight radius is better, which is one of the reasons aperture sights, positioned at the wrist or over the rear action ring, are more accurate - but still a reason.

Rear aperture sights positioned ahead of the action, or down the barrel in the normal rear sight position on a ML are not as easy to use, nor as accurate as rear mounted apertures, BTW.

The further down the tube open sights are positioned, the easier they are to see & likely more accurate for the fellow with eye problems, but less accurate than more rearward mounted sights with someone with better eye sight.