video based image formats have a ton of downsides. Modern video codecs are all designed for large resolutions, while things like icons are often pretty small (6

video based image formats have a ton of downsides. Modern video codecs are all designed for large resolutions, while things like icons are often pretty small (64x64 or less). Videos don't support transparency, don't care about progressive scans, and are more lenient for certain types of errors because people don't spend time looking at every frame. As such, there are a lot of reasons why it is beneficial to use an image first format. https://cloudinary.com/blog/how_jpeg_xl_compares_to_other_image_codecs https://cloudinary.com/blog/how_jpeg_xl_compares_to_other_im... has some comparisons showing how much better JPEG-XL is than HEIC/webp.