Sheesh. Google isn't trying to kill jxl, they just think its a bad fit for their product.

There is a huge difference between deciding not to do something because the benefit vs complexity trade off doesn't make sense, and actively trying to kill something.

FWIW i agree with google, avif is a much better format for the web. Pathology imaging is a bit of a different use case, where jpeg-xl is a better fit than avif would be.