Because sometimes analogies are convenient, although imperfect. Close up, sure, JS is running random code on your computer and CSS is a non-executable description of a page’s appearance. Those are very different. Farther away, they’re both fundamental technologies of the modern web that most new things are built on, and disabling them breaks a huge portion of the web.

And sometimes analogies lead you astray like in this case of comparing the age of some tech to biological age or random code (which btw also breaks plenty of the web) and styling