>Maybe a lossless re-encoding of my website JPEGs to gain 20% size is not worth the 33%

I was unpleasantly surprised when jxl's reference encoder dropped critical exif tags for no reason whatsoever from my personal archives. Turns out their lossless preset wasn't really lossless.

And then webp to JXL conversion also produced different viewing experience results as ffmpeg's webp decoder wasn't handling ICC correctly.

I'm now very cautious of any "lossless" re-encodes.