There are several potential benefits to watching a 4k video on a 1080p screen. For example, 4k videos tend to be shot with higher quality equipment and techniques, which can result in better overall image quality even when the video is downscaled to 1080p. Additionally, 4k videos often have higher bitrates, which can result in fewer compression artifacts and a more detailed, clearer image. Finally, 4k videos may have a wider color gamut and higher contrast than 1080p videos, which can result in more vibrant and lifelike imagery.