I am a bit dumbfounded by some people’s experiences.
I recently reorganized my system on my rack, and I accidentally connected my mono amps to the wrong channels of my pre.
And all that happened, was I heard orchestral violins come from the right channel, and cellos and basses come from the left (and other instruments switching sides). The opposite as to how orchestras are set up.
No loss of center fill, no loss of the soundstage going past the outer edges of my speakers, no loss of depth. Just everything flipped.
And let me add, my system in my room creates a very large soundstage, with very good image within the soundstage. Great layering, depth, width.