At this point adding new {image, audio, video, compression} codecs to browsers is probably a net negative, unless there's a good chance they get deployed across the entire browser ecosystem. Safari is generally the browser that's most conservative about implementing anything new, so their support makes a huge difference in the viability of getting the format universally supported.
I'm not a fan of WebP, mind, but the idea that support for it is dreadful is strange to me.
Personally, the fact that it was Googles idea means I’m going to hold it at arms length, if not avoid it entirely. The web should be built on open standards.
Seems to be a similar level of "works everywhere" for me, with the exception of web browsers this time.
I don't think AVIF is a good example of this though. All major browser makers were members of the consortium that created AVIF.
But it was a tremendous amount of effort and promotion on Google's end for a relatively narrow format.