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It is interesting that H.262 ( MPEG 2 ) > H.263 ( Divx ) > H.264 ( AVC ) > H.265 (HEVC )

That is 4 generation a video codec improvement, and yet as an image format, MPEG 1 based Jpeg is still doing very well compared to latest HEIF. I mean four generation of improvement and we only got 50% reduction at similar quality. Why is it still image don't scale down as well as video?

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Because many of the gains of successive video codecs comes from finding more efficient ways of encoding motion, which is something you clearly can't exploit with stills.

Because different things sitting next to each other in space are not as inherently predictable from each other as the same thing moving through time.

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