The blackest ink still reflects some light, the white paper is not so bright that it blinds us, and the difference is relatively small. Photographic color prints have a dynamic range of less than 2.0 too. Film negatives might have a range up near 2.8. Slides may be near 3.2. These are not precise numbers.
Slides have less photographic range than negatives.
Expose a slide half a stop off and the results are objectionable. Do that with negatives, and you never even realize it. But slide film itself has more contrast, a steeper gamma curve, and while the captured scenic tonal range may be less, the density extremes on the film can be greater. The extremes of slides are more likely to be clear or black, and contain greater dynamic range as seen at the scanner. Images from negatives invert dark noise to be in the highlights, less noticeable there.