100% agree. I'd say JXL is going to be the closest thing we get to a universal image format for quite some time. Almost completely superior to JPEG/PNG/GIF/WebP/etc. and clearly superior to AVIF in basically every way except very low bitrates and animation (which... just use HTML5 video with AV1 webms, what are you even doing?).
Oh, and adoption rates, but considering JXL's standard was finalized less than a year ago and it's already gotten support in so many things and from so many large companies, I really don't see any way that it fails other than Google abusing their monopolistic position in the browser engine space. The people arguing against adding support for a brand new codec because it doesn't magically have 100% support is circular reasoning and feels very disingenuous considering WebP and AVIF were never held to the same standard.