Funny enough, the Phone app on my phone is also hidden inside a folder, so my first guess from looking at the URL "whats-missing-from-this-13-year-old-girls-iphone-home-screen" was in fact "the phone"! :-)
I actually handle URLs on my site this way as well. The slug for my posts can be changed arbitrarily, since it's not used to identify the post in my storage. This lets me change the slug if I rename the article later.
Here's a bunch more thoughts on URL design you might be interested in: https://indiewebcamp.com/URL_design
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