That is a great point, I guess I've never heard (in a home system) a really, really good horn system. I did hear a pair of K's in a high end store about 15 years ago, with Levinson mono block amps. I forget what the source was, but I recall being unimpressed. Especially for $35K mono block amps, wired to 220 volt mains. I remember thinking that they had really blown it when they set the system up, because the K's were NOT in a corner. The mids were crashing through and everything was unbalanced. The bass sucked.
The only other K's I've heard was at a party 35 years ago, and I can't remember what the system consisted of, but I remember that I was very, very impressed with it. Those were in the corners, by the way.
I guess I prefer standard (non-horn) drivers because they're more forgiving. I think my DQ-10 system sounds ideal, because when the music is IN-YOUR-FACE that's what they deliver. Grab your seat, in your face. But they image so well, and there isn't any beaming of any frequencies. They are balanced IN MY ROOM. In your room, they might suck.
The KG-4 speakers I had absolutely rocked out in open air. They had room to breathe, and they sounded very, very good. I remember thinking how I wish I could have gotten them to sound that good inside. Now I've got that kind of performance in spades with the DQ-10 speakers augmented with two Dahlquist low frequency modules, driven by 2KW of WOPL glory. Took a while, but my listening room finally gave in and it sounds just the way I want it to now. And that's what this wonderful hobby is all about, right?