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What's wrong with JPEG and why is not using it beneficial in any way?

I think JPEGs will be around forever, but JPEG XL can losslessly recompress JPEGs to be smaller, so that would be one way.

Depth. Wider color gamut, HDR, the things our devices now capture and render.

And it supports animation by default, so the "motion photos" will be natively shareable.

Also, recompressing JPEG as JPEG-XL gives a free boost, so simply, why not. If you're sharing something in social media or anywhere, there is no reason to not convert and have the other person receive JPEG-XL by default.

My point is less about the size and so on. But what the visual (bit depth and color gamut) and functional leap of JPEG-XL. It's a format that combines and replaces the many different use cases that different formats are doing now.

Weird that your comment got "downvoted". It's perfectly reasonable and pretty informative with the exception of converting old JPEGs to new format automatically. Seems like a huge waste of resources to shed a few KBs off an already ultra compressed file. I wonder if mirrorless cameras will get native support for this format.

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