Tangentially related - HEVC for images

"significantly improves on JPEG" is a pretty low bar, given how old JPEG is. It's already improved on by WebP (almost universally available in browsers), AVIF (based on AV1; very widely available), and JPEG XL (proposed but rejected for technical reasons and lack of interest). You can even get a reported 35% improvement on traditional JPEG just by using a modern JPEG encoder like Jpegli. AVIF is probably slightly better compression than HEIC, without the big patent problems, so there's no longer any need for HEIC.