I totally respect where you are coming from and the debate I remember from the seventies was the value of 4 channels (quadrophonic) vs 2 (stereo). I don’t know that we are comparing apples to apples re: the center channel and music reproduction. Your philosophy of the center channel disrupting the proper image is the opposite of Bob Clearmountain’s (please check his creds here) and that is just one of many engineers/experts who prefer a three or more channel image. I agree re: 3 channel audio recordings being a non issue but there are many ways to integrate more than two channels. I agree that I can watch a movie with a sound bar or a pair of speakers and its better than the TV alone.
I don’t disagree with your preference for two excellent speakers, that’s all good. I disagree that the best strategy to reproduce music is with two speakers, any two speakers regardless of cost. I think the "chrome mountain/sound cannon" approach is the most profitable for the dealer and the most fun for baby boomers with disposable income. Look at all the threads here asking how to spend thousands of dollars with no questions asked about acoustics, it is almost crazy.
The "science" is available today to arrive at $$$$$ type performance on a beer budget. You need to treat your room $, use DSP and get the acoustics right $,
and setup an immersive audio system with a good receiver ($3-$5K), 8 good bookshelf speakers ($1-2K each), a CC ($1k to $2K) and a pair of good subs ($1K or so each +-). If you want to make it OTT add a high end DAC ($2-$5K) and a streamer.
This is 2023, Moores Law benefits consumers, to build a "stereo" like you would in the nineties makes 0 economic or sonic sense, but it can be a fun way to tinker around.
For example, look what Sony can do with a two channel signal via their 360 sound mapping tech, the most expensive receiver they sell comes in at around $3500:
https://www.youtube.com/live/eWBBoi3n_qQ?feature=share