Comment by IshKebab

> Also, JPEG XL is two codecs bundled into one,

That's an internal detail that doesn't really matter to anyone outside library implementors, or when you're choosing encode settings though.

It's the same in Opus. Technically it's two formats, but as long as they're one entity that's either supported or not supported, everything is good.

AVIF does seem to have at least a couple of downsides compared to JXL like max 12-bit depth, no JPEG reencode and worse recompression stability. I think they probably could have added those though, and then we wouldn't have yet another format to support for eternity. Oh well, they had their chance.