Yes, you just learned the very thing that is under debate here: that unless your mom trolls though HN discussions, she would never guess that opening a web browser and navigating to that cryptic URL is the mechanism for installing a printer.
Oh, sorry, I left out the "click shit" part. Do some of that, too.
More importantly, you left out the "minimal Debian box" part. With modern desktop environments, you can just plug your printer, wait a few seconds for it to tell you it's installed, and your done. Way easier than on any other OS.
That's the configuration mechanism in a minimal system where just about everything is disabled. In any kind of system that a novice would be using, it shows up in all the expected places.
Oh, sorry, I left out the "click shit" part. Do some of that, too.