What is with people in Silicon Valley. Without knowing you I could tell that the author runs startups, is from tech type industry, most likely Silicon Valley.
Not everyone wants to create a startup or find content searchable. Some people read because they like it. Not because they want an outcome where it is easily searchable or can get tidbits for future use or can give them eyeballs. It is a very narrow minded world view, quite common among Medium authors from Silicon Valley.
Read a book, tag the page and you will get the same result. And your mind gets a more interactive, tactile, high FPS experience. Not good for the trees, but seems like a lot of upside otherwise.
Medium has become formulaic — Click the heart? really?