"No one supports it" because support doesn't just happen overnight. These things happen slowly. Same way they did with jpg and png.

Sure, part of the "better" is the audiophile "better quality" thing. But the major point is that it's objectively a better compression. Which means less data needs to be transfered, which means things go faster. Sure people claim they "don't notice" an individual image loading, but you rarely load one image, and image loading is often the bulk of the transfer. If we can drop that by 30%, not only does your stuff load 30% faster, but EVERYONE does, which means whoever is serving you the content can serve MORE people more frequently. Realistically, it's actually a greater than 30% improvement because it also gets other people "out of your way" since they aren't hogging the "pipes" as long.