SemiLiveMusic,
You pose an interesting question.
I could envision certain venues where a speaker arrangement like you suggest could be not only functional but possibly even preferable. I could also see a benefit to using, on occasion, 4 seperate stands instead of the two, and setting up one pairin the normal stage area and the other pair further out in the room to help cover a LONNNNGGG room. You know the sub will cover but the satelites spread out could be the better route in some rooms.
I guess it all depends on the needs of each room and it's dimensions etc. Also if it is a very "live" room could make diference on how you may want to set up. possibly lower volumes but with speakers spread more may be preferable...
Lots of possibilities. But it's easy to get too carried away with complex set ups sometimes. I am a strong believer in the old and true "kiss" rule. You know, "Keep It Simple Stupid" ( no offense of course)

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The old Newb