I think coincident drivers tend to have a slightly bigger sweet spot, with the Blade being very special in this regard
Completely agree with you except that I would change slightly to hugely! For decades I used Quad Electrostatic loudspeakers (ESL-63 and ESL 2905) which emulate a point source of sound about a foot behind the flat panel. The soundstage, imaging and sweetspot are huge. I recently added KEF Reference 1 speakers (more reliable) and they have much the same characteristic.
With speakers like these you can stand up and walk around a holographic-like soundstage. The comparison with conventional multi-drive speakers is astounding - no need to use a vice to lock your head into a narrow horizontal plane and precise distances from each speaker.
The physics is to do with cancellation and reinforcement where separate drivers and their reflections interfere with each other. The ear/brain system quite quickly adjusts to the 'cleanliness' of apparent point sources and their coherence. The corollary is that going back to conventional speakers is difficult.
When auditioning speakers I always move around a lot!