You appear to be getting rather worked up over someone not understanding what you see as basic physics. Yet I don't understand why you, or anyone else, hasn't thought of the, to me, blindingly obvious answer to the problem of the high action on the fretless part. Ask yourself this, why does the board have to be the same height along its length? If the fretless part was the same height as the top of the frets then you could achieve a nice low action on both the fretted and fretless areas, whichever way around they were. Even better action could be achieved for fretless if the fretless part were at the lower end as the nut could be filed right down, nearly to the board as a fretless should be.
Some people don't/can't visualise things the way that others can, but there's no reason to belittle them.
🙂