JXL can losslessly recompress the billions of JPEG images out there, which AVIF cannot. Also, from your link: "JPEG XL has better lossless compression compare

JXL can losslessly recompress the billions of JPEG images out there, which AVIF cannot. Also, from your link: "JPEG XL has better lossless compression compared to WebP, which has better lossless compression compared to AVIF for these images." I would then argue that the superiority of AVIF over JXL is a point of view at best.