What problem does this address?

Pulled from here: #16479 (comment)

When a background image is set as background, it would be nice if also the dominant image color is automatically set as background image. Then the element already got a good color while the image still loads and when images are disabled.

What is your proposed solution?

An initial exploration was started here for prior art that needs to be updated to be in line with the current implementation: #22564