But I think sounding “real” is the most basic requirement for a high end system, because I know what real sounds like, and euphonic, or pleasant to listen to, and not irritating, is a close second.
You make an important distinction. The point I was trying to make was that I don’t require the level of "reality" that qualifies as "high end" in order to thoroughly enjoy listening. I’ve listened to friends’ high end systems and enjoyed the more refined sonics but in terms of my emotional engagement with the music, I haven’t found their systems to be superior to mine.
Having only recently, after a long struggle, succeeded in removing lingering "irritation" from my system, I wholeheartedly concur that lack of irritation is a basic requirement. Irritating sound = irritated listener and none of us want to be that guy!