I completely concur with your conclusions. Spheres are the correct shapes to be used. Boxes are only for convenience not for sound quality. Andrew Jones has used something that is faceted so he has clearly applied my theories. But unfortunately he couldnt do a sphere as it is not easy to do a wooden sphere.
If Magico could lower their prices down by about 90% then I think that would even the score. That would enable manufacturers to produce spheres at reasonable prices.