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I think there's a difference here.

If I right click save and get a webp, it was probably converted from JPG. Very very few images are uploaded in webp. So getting a webp image means you've downloaded an inferior version.

JXL doesn't have this issue because conversion from jpeg is lossless. So you've still gotten the real, fully-quality image.

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Let's be realistic - when most users are upset they got a .webp, they're not annoyed because of quality-loss, they're annoyed because they can't immediately use it in many other services & software.

This is still a problem with AVIF, too. Image viewers that support the format often don't support animated AVIFs, and even GitHub still for some godforsaken reason treats .avif files in a repo/PR as binary files instead of images. I think Discord just recently started supporting AVIFs, so that's progress.

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