I maintain that it's relevant because it illustrates how unreliably people assess just what knowledge is likely to be useful. If anything, the fact that it was retconned reinforces that such assessments can be wrong.

For example, there's a notion in this thread relying on GPS makes you soft and that unless you learn how to navigate the way your forebears did you'll be unprepared or something. I find this proposition just as dubious as the notion that actively forgetting that the earth goes around the sun helps you solve murder mysteries.

It seems to me as though such assessments are often driven by self-interest and the desire to maximize the social utility of one's own knowledge and experience. Of course, those who believe that that "GPS makes you soft" is unquestionably true may find fault with my perspective.

I also just find that passage hilarious. It's simultaneously so misguided and yet so compellingly crafted, which is what makes for great satire whether intentional or not. My Dad read Sherlock Holmes stories aloud to me when I was a kid and that passage has always stuck with me. But perhaps this wasn't the right audience to share it with.