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Apple doesn't even support their own HEIF on Safari. Why would one expect them to support WebP? Not to mention the gain on WebP is actually relatively small. JPEG, despite its age is still getting encoder improvement.

You would have expected or assumed nearly 30 years since the introduction of JPEG, we could compress an image at 0.5 bpp ( bit per pixel ) that has higher quality than the best JPEG with 1.0 bpp.

It turns out that is still not the case, Not with WebP, AVIF is closer but still not there. Just like in Audio, Despite all the marketing claims about mp3pro, HE-AAC... etc having mp3 128kbps quality at half the bitrate. It took us nearly 30 years to get an Audio Codec that sounds better than the best mp3 encoder at lower than 128Kbps bitrate. And that was Opus at 96Kbps. ( At this point no body cares about those bitrate savings any more )

That is not to say image compression aren't improving. [1] Is an 4K image compressed by the next generation VVC Reference Encoder at 350KB.

[1] https://imgsli.com/MTI1NDA