If you think about it, in-wall speakers have practically infinite wide baffles, so no baffle step loss or baffle edge diffraction occurs, also there is no delayed reflections from the walls behind the speakers, because there is no wall behind the speakers.I'd say the room and proper setup does more. I say this because the best soundstage I've ever heard was in a well thought out home theater with Monolith thx in walls. The room just dissapeared. Blew my mind.
But the physical shape of the loudspeaker affects the FR and dispersion too.@Blake Klondike maybe what you are hearing from the Totem is much more related to their dispersion and FR than their physical shape.