Fair enough.All speakers have this issue to one degree or another.
I built some loudspeaker prototypes about five years ago which do not suffer from this. They have a spherical sound-wave, not stereo everywhere just sound everywhere, and pretty good sound if I do say so myself. I really should get back to tinkering with those again.
This thread is odd for me to take measure of. Wilson's are the epitome of box speakers (the hard shell crab), Martin Logan is the epitome of panel speakers (the jelly fish).