> That's kind of the point, Chrome shipped it across multiple platforms two years ago

Chrome ships a lot of things. Even now WebGPU is marked as experimental technology on MDN.

WebGPU didn't even become a Candidate Recommendation until December 2024 (half a year ago)

> Apple are just dragging their feet.

Or they are not in any rush to implement APIs that haven't reached consensus, haven't passed reviews, are subject to change etc. Chrome has very very cavalier attitude towards shipping APIs.