"there's no actual evidence to back it up"
For the keyboard there's practically no debate, as for "actual evidence" it's hard to quantify a somewhat subjective typing experience but when enough of the reviewers say so you've got a general consensus. For the chassis I could only say that there are more reports of failure for XPS chassis, and there's generally more creaking to indicate low structural strength which is often noted here at Notebookcheck.
"To the majority of people..."
You can stop here because you started off on the wrong foot, this is the high end panel and is not meant for "the majority of people" but for "a couple of *typical* usage cases" as I already mentioned, and if Notebookcheck's methodology is correct(I trust it is most of the time) color gamut is rated at a certain brightness, usually around 200 nits, the further you push the panel away from this brightness the less of the tested gamut you'll get, your fake "pop" mainly comes from the boosted contrast and brightness and is of very limited use to the targeted professionals, thus it can be said that HP and Dell's compromised efforts to potentially impress "the majority of people" on their top tier options leads to reduced usefulness in "a couple of *typical* usage cases" that are instead more likely to generate sales at this specific price level.
"Why the effort? Because we asked for them."
That's your opinion. I don't think that's the case at all, it's what competition's for, and many advancements are linear and we're bound to get there some day.
"You seem to be under the impression that OEMs cherry pick superior and more reliable components for their business class laptops."
I am not, what I'm saying is some models are while expensive, with better-than-average components that genuinely raise costs but are not apparently better unless you dig for specifics, however, some models are expensive yet still cheap out on components(like Surface Studio) and *no* cheap alternative is going to get you components like that.
Component lottery is while widespread practice, but not certain to plague every model, for example I have a tablet that only used ToTL(at the time) SM951 for every tier except the base tier. So unless you have proof that X1E's 1T SSD is a lottery this isn't an issue.
"...with x2 DDR4 SODIMM slots..."
Not part of the discussion, you're assuming that most buyers will immediately upgrade RAM by themselves after purchase, and even assuming that, the X1E's maintenance is the easiest. Another assumption needed for this to be of any relevance is that you can get the better GPU with different tier RAM in any combination, but that's not the case and to get the much faster 1050Ti you'll need to start at 2x8GB, which then go to waste when you swap them out for 2x16GB or 2x32GB, and RAM price will most likely need another year or so to return to 2016 levels, so currently buying your own isn't a cheap affair either.
"I am still recommending the XPS 15 that starts at $1,030..."
You completely missed the point, I was talking about top tier models and "closest to perfection" the entire time, at base tier they're all far from perfection and frankly they could be treated as completely different models just in the same shell.
"But I do...And that is all that matters."
Being so self-important isn't gonna get any of these companies to budge. This brings us back to the beginning:"The fact here is that this laptop fits a couple of *typical* usage cases incredibly well, which means more people paying, not just you."