I've also never liked a narrow sweet spot. And it's not only about allowing more than one listener to experience good sound. I find if a sweet spot is really narrow it's just bothersome in of itself.
It's why, when plasma and LCD TVs were duking it out years ago I much preferred plasma, which looked essentially the same from all angles, where the LCD technology shifted tonal/colour/contrast balance when you moved even a bit off axis. Something about the sheer finickiness and unsteadiness of that effect irked me.
Similarly I dislike head-in-a-vice speakers, Martin Logan stats being a perfect example (I've heard the majority of ML models and my pal has ML hybrid stat speakers). The "illusion" is just so easily collapsed with even mild movement of the head.
So pretty much all speakers I have bought over the years have maintained similar soundquality/imaging over a relatively wide sweet spot. (Audio Physic, Thiel CS 3.7/2.7, Waveform, Hales, MBL and many others).
Though I still harbor background thoughts of Devore speakers some day, one sticking point was the more directional high frequencies for those speakers (due to the beaming of the woofer and waveguided tweeter).
The Joseph speakers are a good match for my circumstances as I have some pretty limited set up possibilities in terms of distance to the listener (between 6 1/2 to 7 1/2 feet or so). The Josephs are flexible and don't need much distance at all to sound coherent.