For the web, you might use it when you want alpha channels. WebP is still not supported everywhere.
Regardless, it’s useful as a comparison in the article to show just how good h264 is versus other compression techniques. They are not recommending PNG or anything. WebP would only produce a 20-50% smaller file, not 1000x smaller, so it doesn’t really matter which image format they compare to.
Regardless, it’s useful as a comparison in the article to show just how good h264 is versus other compression techniques. They are not recommending PNG or anything. WebP would only produce a 20-50% smaller file, not 1000x smaller, so it doesn’t really matter which image format they compare to.