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

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.