Agreed with the write up. I find it interesting how much psychoacustics plays a big role in our listening experience as well. Aside from that, I'm not too qualified to talk about that stuff since I don't know much about it and I'm a software engineering major.
As I stated prior about the Vega, I love them. They sound amazing. Since I can play guitar, violin, and sing, I have some point of reference to go off of. Very few IEMs can capture the essence of the violin. Just on sound texture alone, some always seem to catch it wrong. The Vega is one of the very small few I have listened to, which I also own, which can reproduce the same feeling I get when I play or listen to violinist live. On the non-scientific way of explaining it, I notice the bite of the strings. Its almost like I can tell the difference between a dark synthetic string set versus a steel. Kind of like telling the difference between "Pirastro Evah Pirazzi Gold" and "Obligato" string sets.
Since I actively play violin more than I do my guitar, I can definitely tell the texture difference. Even more so, it conveys the playing well too. I can sense how much the player is digging into their strings. The piccato is fast and precise.
Before the Vega, I had the Jupiter, Westone UM Pro 50 and W60, and Monster Turbine Gold Pro. The Monster was what got me into high-end audio. Out of the list, the UM Pro 50 was the only IEM to get me anywhere remotely close to the same "soul" feeling. But the soundstage and everything was just dark and closed in. The Jupiter sounds wonderful too. I'm not saying its bad, because its excellent. The only thing is that I get the feeling of music with all the technicality from the Vega, which wasn't present in the Jupiter.
Maybe, the Andro is more accurate or faster and detailed. In my eyes, music is about feeling it. Soundstage is never always everything, just so long as it is decently sized. Having good detail and soundstage is only half of the battle. Creating the world of music is the other half. They might be sound devices recreating something, be it a live event or something recorded in the studio. But its also capturing one other thing, the soul. So the question might be, for you at least, "What is the soul that I feel when I listen to music out of the Vega or when I play violin"?
I've always been curious about why I feel so intensely about certain IEMs but not the others.