I listen to music both critically and more as background and would certainly concur in the likely diversity of priorities by those who listen. As have stated, I enjoy stereo but have also have experienced better multichannel recordings. Would be the last one to want to say there is only one good solution. Does not mean I cannot see where improvements might be made in both production and delivery of sound.
My music is representative of wide spectrum of content across many genres. I listen to diverse genres (rock, pop, new age, classical and jazz). I have 3 systems in different rooms. Two are stereo and one is multichannel. They have gone through decades of upgrades and will likely continue to do so. My one stereo has speakers against the wall while the other room has them more away from walls. Along with production variables, reproduction variables are numerous. So, am not sure what you think can be gained from examining one or more of my music preferences.
I do have some test tracks for stereo but nothing that tests much more than center image. If you have some other way to test stereo soundstage in more dimensions, please share. I have one for testing multichannel as well but does not do much more than testing each channel. Would be much better if it demonstrated how a sound might be heard in multiple places where no speaker is located. I can accept sitting in a sweet spot, but would be more impressed if I was not limited to do so.
We may need another thread to take a deeper dive off topic, but know just where I would create one!