1. Em-dash overuse
L1: emdashWhat it isLong dashes used as all-purpose glue: to add asides, heighten contrast, or avoid choosing between a comma, colon, and period.
Why AI does itModels learn that the em dash makes prose feel polished and flexible. It lets a sentence keep going even when the thought should be split.
ExampleThe update is fast — really fast — and easy to use.
The update is fast and easy to use.
How to fixKeep an em dash when it creates a useful interruption. Otherwise use a period, comma, colon, or nothing. If a short paragraph has several, cut first. Deep dive: why AI uses em dashes.