Not many processors have AV1 hardware decoders yet (Apple thru them in on their M3’s last year and latest iPhone 15 Pros) so I can’t see it being that. There’s also software decoding that works fine. My wallpaper on macOS has been avif since last year (Sonoma) and works without issue. I don’t think it works in Windows 10 tho. No issues with the latest Ubuntu and I’m not familiar at all with Android OS.
In any case, I think it’s the best thing to come out in a long time. My website with raw PNGs was about 120MB. I crushed those PNGs with noticeable quality loss down to 50MB. I then crushed the original 120MB down to 60MB with minimal to no visual quality loss using webp. But I got it down to 25MB without loss using avif at 85% compression. Just insane performance, couldn’t be more impressed!
Every time I have to fire up my Fb account, I’m stunned at how shit React is. It’s appalling how bad that framework has become. Maybe if they cared about implementing solid code and less about raping your life of metadata in order to sell you the worst products on the planet thru their “partners” things would be better.