First copy and inspiration are not the same. Second the older Genelecs waveguides where elliptical. Have a look at the Genelec 1029a from 1996...Could you state some concrete examples? And does that mean that K+H/Neumann copied them? They were all squared boxes with waveguides, Genelec used in the past spherical waveguides while K+H rather elliptical ones. Also with that logic Genelec copied Neumann with their new cardioid sub as K+H had a cardioid bass monitor in the 60s...
The few years later introduced K&H O 104 and even the newer Neumann KH 120 are very similar to the 1029a.
You have some pro and cons of cause. The DI of the Genelec is way more linear and you can see that the wave guide and box are better optimized so that there is less diffraction and unwanted behavior in the frequency response. You see with the KH 80 that neumann is getting better with the optimization of this and comes closer to the older genelecs.I was the one who noticed the SP dip more than a year ago https://www.audiosciencereview.com/...nn-kh120a-or-genelec-8030c.11109/#post-314241 , on the other hand the Genelec 8030 is less flat on axis and has the DI peak just higher in frequency and the KH120 waveguide has a smoother DI on the last octave https://www.audiosciencereview.com/...20a-or-genelec-8030c.11109/page-8#post-551248 , everything is a compromise.
The Geithain ML 811K1 is their "best" monitor and it has a 10" midrange driver. You use cherry picking to support your claim.Genelec, Geithain you mention all use up to 5" mid drivers on their best regarded monitors.
@Zvu is right there are multiple solutions to get perfect mids.