Another way to look at it maybe, is by comparing it to having a soundbar setup that gives you the "OPTION" of incorporating two "separate/independent" front left right speakers (the soundbar would function as the center). I only mention the soundbar comparison to help everyone better understand the "OPTIONS" created/afforded by the setup described in my OP, not to take away from it.
But the thing about soundbars is they're junk. Not only because they're tiny, but because you can't load five speakers into one box and call it 5.1. It does not work. Some are better than others, and in some, very carefully set up systems/rooms can almost give the impression of real surround. But they usually require you to sit in the sweet spot(which I do anyway), otherwise the effect is a fail. Also,(among other considerations) LR speakers(mains) need to be spaced apart from each other to properly image. So I ask again. Why would I want my two main speakers huddled together under my display? In my simple brain, it appears you've basically made a soundbar with two speakers. Or no?
Is this the wrong forum? I wouldn't say so exclusively, but usually it's a give and take. When asked specifically about certain things, one usually responds to that directly vs pointing back to their original post. We all have plenty of questions, but I will try this again with my very simple one. What advantage do I receive by placing my two most important speakers together under my tv? And don't tell me "options". I'd like to read about a real advantage, then we'll continue. I'd hate to see someone interested in the hobby to leave as it seems more people every day are losing interest. And maybe if you stick around to can learn something.