You realize that your statement, effectively, is that omnidirectional speakers can sound as good as directional speakers if you negate all the effects of their omnidirectionality?

But I didn't say that. I actually said that in an acoustically dead room everything sounds shit. Just like in a completely empty room everything sounds like shit. You need to place differently radiating speakers differently and use different room treatment (not just absorbtion, but also difusion) for the best sound, how isn't that obvious? Yes, narrower constant directivity speakers will almost always sound better, but omnis will in many cases sound better than any traditional non-CD speakers.

Well this is just silly. A closed acoustical system of such small size affected by the shape and size of everyones head and ear is almost impossible to do right, and the imaging of large headphones has many compromises, only different ones than speakers do. Maybe in-ear monitors playing binaural recordings could be closer, at least in the second aspect. But you seem to be saying that something like putting speakers in an anechoic chamber to completely remove any interactions would be the ideal system, and that's be wrong.

So on one end we have your experience and on the other end we have my experience and research of people like Siegfried Linkwitz or Floyd Toole, one of the few sane people in the industry. What do you expect me to say?