And sunsets, and parallax effect, and visible curvature, etc etc.

It's a combination of two major factors: The camera is pretty low-resolution, both in its ability to take video, and pixel density, and because there's no atmosphere to give us the "blur" and color filtration we're so used to seeing around objects.

We should colonize it so we can give it a repaint!

Technically, lithobraking is the final stage of any descent, but high speed lithobraking is usually not conducive for future mission objectives.