The benefits
Soft, even daylight without the glare or the gloom. The room stays bright but comfortable. Daytime privacy as a silhouette, so a street-facing living room feels private without being shut in. And a decorative, textured finish that suits the fabric to the room rather than treating the blind as purely functional.
Daytime privacy only
Like a sunscreen, a light-filtering or sheer roller gives privacy during the day but little at night. Once the lights are on inside and it's dark outside, the silhouette privacy disappears. For a room that needs to be private after dark or fully dark for sleep, you'll want a blockout layer as well.