Why is this even a consideration?

Apple users seems to be the only ones that even care about "resale" of their computers, almost like they are investments rather than tools.

Because Apple hardware costs more. They're trying to make a point that it sorta-kinda doesn't, in the end, if you bother to sell the old stuff.

I upgrade my PC hardware by throwing away/recycling the old one and buying a new one.

I upgrade my Apple hardware by selling the old one on Craigslist and then buying a new one.

In both cases, I spend about $1000 net each time. In the PC case, that's +$0, -$1000. In the Apple case, that's +$1000, -$2000. Either way, it's -$1000 net.

If you prefer Apple products but think they're "too expensive" because they cost ~$1000 more, this is why people tend to disagree. They paid that ~$1000 once, as an "entrance fee" for their first laptop, but they don't have to pay it again.

Because I thought I saved money by buying Lenovos on paper at least as good as the Apples. Only to have a resale value of about $10 after 3 years when time came to buy a new laptop. (If the hinges etc lasted that long.) A Macbook is more expensive, but not only did it last me +3 years, I sold it for about a third of its original price, money I used to pay part of my next Macbook. That's why.

TL/DR - only Apple devices HAVE a resale value.

Enter my annecdata: I had to surrender my work MBP and got an XPS 15, supposedly one of the best non-Apple alternatives. Alas, here I sit, typing this on my 2008 17" MBP. Even though it has worse spec is nearly every way, it's just a much more usable notebook for me. TL;DR: The Apple premium is still [so far] worth it for me.

Anyone want to buy a barely used XPS 15 (top spec)?