> [0] https://en.wikipedia.org/wiki/JPEG_XL#Industry_support_and_a...

JPEG XL is a general purpose image format, like JPEG and PNG, but improved. WebP is not a serious modern image format; it doesn't even support 16-bit channels. WebP has one specific purpose: web delivery of ephemeral images, leveraging VP8 hardware decoding driven by consumer consumption devices. That's what Google, and web-oriented companies in general, care about. They have no particular interest in general purpose image formats.