I have never seen banding before, the image seems specifically picked to show the effect. I know it’s common when converting to less than 256 but color, e.g. if you turn images into svgs for some reason, or gifs (actual gifs, not video)
Also dithering exists.
Anyway, it’ll surely be standard at some point in the future, but it’s very much a small quality improvement and not something one definitely needs.