The matrix of sources for a large picture can be mind boggling huge.

We have jpeg, webp, avif and jpegxl. Portrait orientation and landscape. 3 or 4 different pixel ratios and of course, different screen resolutions. Dark mode support doubles all of that work. Hardly anyone is going to do all of this correctly, automated or not.

Thank you! I wonder if we'll ever see avif/webp takeover or if it's gonna be like ipv4/ipv6.

I've primarily been using AVIF with JPG as fallback on my blog for a few years. The efficiency gain is wild. I wonder if AV2 will be integrated into AVIF at some point (AVIF is based on AV1).

Interesting, I don't seem to see options for this in avifenc for example, I suppose this needs fancier interaction with the library directly