Well, JpegXL does have one really cool feature: you can transcode jpeg to jpegxl (and back) losslessly. For jpeg to jpegxl it'll save something like 15-20% in size.
This is probably going to be a key feature for web platforms. They can convert their massive backlogs to jxl for free space savings.
This is probably going to be a key feature for web platforms. They can convert their massive backlogs to jxl for free space savings.