Because you can navigate the command prompt and write batch scripts,
Even after all those years, DOS command line is still so pitiful that I have to install Cygwin whenever I need to do any serious scripting on Windows. Knowing DOS command line won't help you understand Unix shells simply because the most useful Unix shell features don't exist in DOS and things like variables and pipes are so limited in DOS that they're almost useless.
are familiar with driver configuration concepts (still relevant today if you're developing them, admittedly pretty useless just as a user of PnP hardware),
What driver configuration concepts?
know what Windows binaries look like inside (assuming you used the debug program available at the time),
We didn't, I don't and I don't see the relevance of such knowledge. Those who really need to know that can look up the documentation and learn it in a week tops.
understand hierarchical file systems and the Windows registry, are familiar with Windows shortcuts files,
Most of that knowledge is so trivial that anybody with half a brain can learn it in five minutes. Except Windows registry (we didn't learn that at school BTW) which is a nightmare.
are familiar with Windows' built-in programs (really, many of them haven't changed that much since 98),
Like Minesweeper and Solitaire? Because those built-in programs were by far the most used at our school.
probably have pretty good keyboarding skills (that was one of the main things I learned in elementary school computer classes, and I'm probably within five years of your age),
I have but school had nothing to do with it. I'm writing this on Linux with a custom Dvorak keyboard layout BTW.
and plenty of other things, both vendor-specific and not? Computer skills don't just evaporate with each new OS release, or even switching between completely different systems (although it sometimes feels that way when I use a Mac, and yes, I use both Linux and FreeBSD...)
Lots of my fellow elementary school students probably still think that if you change filename extension of an Excel spreadsheet from XLS to CSV, you'll be able to open it in a program which only supports CSV files. Other basic concepts of using a computer that they probably don't understand: When one program doesn't have all the functions you need, you can combine multiple programs supporting the same file formats to do the job. Solving repetitive tasks using loops and conditions. Using styles in word processor documents/HTML pages/other formatted text.