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JPEG is Dying - And that's a bad thing | 2kliksphilip
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This is a most excellent place for technology news and articles.
https://xkcd.com/927/
The video actually references that comic at the end.
But I don't see how that applies in your example, since both JPEG and JPEG XL existing in parallel doesn't really have any downsides, it'd just be nice to have the newer option available. The thrust of the video is that Google is kneecapping JPEG XL in favor of their own format, which is not backwards compatible with JPEG in any capacity. So we're getting a brand new format either way, but a monopoly is forcing a worse format.
The other thing is, disk space and internet speeds just keep getting cheaper so... Why change just for disk space?
The bottom line.