A few places I found so far:
* https://longform.org/
* https://longreads.com/picks/
* https://getpocket.com/explore/trending (some fluffy articles but usually can find a few gems)
Their game is this: ostensibly the articles are book reviews. But not quite. Sometimes two books are reviewed in the same article. Sometimes you'll have to read two thousand words until the book "reviewed" is first mentioned.
The book is basically the back story, a hook to the author writing his own longform article on the same issue. Informed by the book, sure, but no "the author then argues that..." recapitulation.
My experience is this: I get a new issue and read the table of contents. Not a single article sounds even mildly interesting. This issue is a dud.
Then I start reading. Some of the articles are boring. Or too high-brow. Or whatever. But in every issue, without fail, there are two to five articles that turn out to be really, really interesting.
See the article about public toilets I submitted here on HN yesterday. Or I remember an article about Heligoland under British occupation. Or about two very strict schools and their pedagogical philosphy.
I don't have a problem maintaining a reading list. Quite the opposite.
As a student, it's great to be able to look at problems from different perspectives.