Science helps demonstrate facts. When do those facts matter to a given listener, is for him to decide. Because at the end of the day, listening to music is a personal activity and a subjective matter.
To be very clear, having a rational explanation for why you want to use crossfeed, does not make that explanation into a scientific fact about why everybody should want crossfeed, or why it's an objective improvement. It's easy to have a perfectly rational and objective reasoning leading to false conclusions. Almost everybody wrong about something(so all of us several times per day), followed some reasoning that made sense to them based on what they knew(including their biases), and what conclusions they were hoping for. Start with a false axiom, ignore relevant variables, or jump to conclusion(you've done all 3 for crossfeed), and chances are that you'll end up with something erroneous no matter how seriously you do everything else.
In this topic you have avoided a scientific approach as often as necessary to keep your claims alive. Always looking for what agrees with you, always ignoring or finding reasons to downplay the influence of the missing variables of crossfeed(based on a speaker model). Always finding excuses not to mind the errors between crossfeed EQ and a listener's own Head Related EQ(again, speaker model). Often copy pasting knowledge and conclusions from speakers, rooms and listeners in them, right onto crossfeed as if crossfeed was objectively the same system. And that despite how you completely agree that crossfeed is its own thing and not the same as speaker playback. And of course all the times when you're making arbitrary decisions about what matters objectively, based on your own subjective impressions. If all that is science, I'm the singer from Iron Maiden.
If I had to bet on why all this is happening here and nowhere else with you, I'd go with the sunk cost fallacy. You've invested yourself so much into crossfeed that you've lost all objectivity about it and instead you just hold on to that completely unnecessary need to justify it. Why does it have to be more than something you enjoy using?