Waiting around for people to embed metadata in their webpages is a terrible business strategy. This is way better for google than something like an embedded RS

Waiting around for people to embed metadata in their webpages is a terrible business strategy. This is way better for google than something like an embedded RSS feed. This lets google generate the equivalent automatically, without webmasters needing to do anything. Yes, this occurs at the expense of other things (annoying developers). But that's the reason.