>Browser vendors have other priorities besides having the latest-greatest compressor: code size, attack surface, long-term maintenance and compatibility risks, and interoperability.
You’ve missed two most important ones: “business reasons”, eg trying to harm some (potential) competitor, and someone trying to get promoted. Don’t assume there are valid technical reasons behind every corporate decision like those; usually there aren’t.
Maybe if JPEG XL had a chat functionality, Google would have a motivation to include it…
But seriously, it's an ISO standard with a free implementation. There's no Google competitor attached to it. Nobody gets prompted for failing to add features. Google is even missing out on a chance to make Safari look outdated again. There's no reason to interpret indifference as a conspiracy.
BTW: I've worked on the HTML5 spec and codecs for many years, so I've seen how the sausage is made on both sides.
Incorrect. Facebook have said they want to use JPEG-XL. Facebook/instagram is definitely a big tech competitor to google, especially in regards to ads.
You’ve missed two most important ones: “business reasons”, eg trying to harm some (potential) competitor, and someone trying to get promoted. Don’t assume there are valid technical reasons behind every corporate decision like those; usually there aren’t.