Robot vacuums with brush roll vs without brush roll: Brush roll is essential for carpets

Brush rolls flick dirt loose from carpets, but not every robot vacuum has one. Models like [iRobot Roomba](https://www.amazon.com/s?k=iRobot+Roomba&tag=wehavethat-20) 694 and [Roborock S](https://www.amazon.com/s?k=Roborock+S&tag=wehavethat-20)7 MaxV Ultra include them; brushless vacs on carpet are basically dust shufflers. If you have carpets, check before you buy.