[hxtk]

JPEGXL doesn't refer to the same standard as JPEG. JPEGXL competes with AVIF in as a next-generation image format. It also has some properties that make it very nice for the web, such as the fact that a truncated (e.g., because the download hasn't completed yet) JPEGXL image is also a reduced-fidelity version of the same image, which with large images gets you much faster LCP compared to AVIF where the image remains unusable until fully downloaded.

[gethly]

Seems like a very small advantage to warrant all the necessary work needed to make it mainstream. Who would use it as advanced image format when a person that would be interested in such a thing would likely already be handling webp or avif?