Sometimes a format is simply just good enough. The gains that WebP may or may not have definitely do not get it over the hump of being so tied to a browser. AVI

Sometimes a format is simply just good enough. The gains that WebP may or may not have definitely do not get it over the hump of being so tied to a browser. AVIF is still very new, but other than the anim stuff, is it enough of an improvement to get people to switch. And that brings me to the entire corpus of existing files. A JPEG decoder will always be necessary based on the amount of preexisting files requiring it. If you have to support JPEG for some, might as well continue making new in the same format as well.