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The author didn't actually compare the different images in each encoding with examples of file size and image quality tradeoffs, just a screenshot from lighthouse.

The screenshot is cropped, there are more than just two assets that would benefit from being in WebP.

"i don't get what apple has to gain by not supporting webp"

I am not totally savvy as to the difficulty of the feat but, at least in principle, would it not cost them less in time and maintenance to not implement or support a feature?