Some of the things you are writing is not correct.When the driver is flush with the baffle (or wall), there are no concerns of early reflections from the same wall. The wall acts and approaches an infinite baffle and there will be no delays of concern. (And SIBR effects in the bass region are clearly audible, so I do not agree that they are much less disturbing.)
Speakers placed at a distance from the wall benefits from wall damping to reduce SIBR effects and reflections higher in frequency that could disturb stereo imaging.
Speakers placed far from the wall will have less problems, since the power of the reflected vs. direct sound will decrease. However, most of us do not have such large distances in rooms. Distance to wall is not related only to the 2 ms window affecting stereo imaging, but a much broader time window where the wall gives an artificial reverberation and sameness of music masking the "true" reverberation present on the recording. Some like the effect since it may give more "depth" - but again, musicians are not normally lined up two dimensions in front of a wall, but placed in three dimensions in a room.
Without multiple speakers and multi-channel recordings that may give hint of "being there", you may rely of seeing you room as a lounge with an open side against the room where the musicians are playing. Thus, the wall of the speaker, being both a friend and a foe, needs to "disappear". The Carlsson speakers are one compromise, in-wall speakers another.
The high frequency reflections on the wall with inwall loudspeakers are VERY problematic for sound quality. You really have to put acoustic material on the wall, around the loudspeaker.
Thats exactly the way Carlsson oa50 and oa52 and oa61 loudspeaker works.
Without the damping material, the sound will be terrible.