I concur...that has always been one of those things which made horns a difficult commitment for me to investigate. The few that I have heard were not as compelling a proposition as I had hoped to investigate further and more thoroughly. And certain speakers (2' x 2' footrpint of XLF, 2' x 3' of Rockport Arrakis) just deliver such enormous dynamics, power, nuance, etc...in such a small footprint, I can understand why these options exist (ie, for people like me).
That said, I remain intrigued by what the 'best' of horns can provide...Living Voice 4-box, Avantgarde Trios + basshorns, and of course the big Oswald Mills Imperia (7 feet tall by 5 feet deep!) with its dual 21" subs (which appear to have some kind of horn design with those cones). Anything bigger than these REALLY starts to become difficult to fathom (Bionor's are the obvious one, DDK!)
My favorite sushi place in London, Yashin, does not have a good dessert chef. That does not mean an alternative is the corner sandwich shop which does the main course and brownie with the same consistency.
In short, even without a bass that is horn loaded below 100, there are 15 - 20k of music in highs, midrange, and midbass that the horns do much better. It's difficult for me to listen to violin, brass, woodwinds, and piano on most cones especially wilson and magico and raidho. That aside, it is not cones have a consistent implementation approach from top to bottom. You can check if their drivers are similar with same sensitivity and impedance on top and bottom. The incoherence through the crossover is quite easy to hear especially the bigger the cone gets.
ps: The OMA Imperia is quite lesser quality compared to their own Monarch. The Imperia is too disjoint.