Some people do use paint brushes for manga drawing. It depends on the style and effect they want to achieve. For detailed and traditional-looking art, paint brushes can be a great choice.
Sure, paint brushes are used by quite a few manga artists. They can add texture and depth to the illustrations, but not everyone prefers them as there are other tools available too.
Yes, many do. Paint brushes offer more control and can create unique effects for manga art.