WebKit already added support for it if I remember correctly. It's just not on Safari so to speak since it uses the macOS stack for this, so it needs the OS itse

WebKit already added support for it if I remember correctly. It's just not on Safari so to speak since it uses the macOS stack for this, so it needs the OS itself to adopt it, but Apple was clearly interested in it. And web browsers aren't the industry. Adobe added support for it, for example, and it didn't really seem like Google did a good-faith discussion with actual industry players, who range from content creation software to OS makers to other web browsers. It's also not like there are people lining up to use AVIF right now and Google is still pushing for it.