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angularjs and other JS rendering techniques make the plain HTML look a mess. Google will not be able to present the page or get its content properly, so you use something like this to take snapshots of your website post rendering and expose it for indexing & website previews. (https://developers.google.com/webmasters/ajax-crawling/docs/...)

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I would be surprised if Google was not doing this themselves to some extent.

They are not (although they definitely should be). Google will read and index javascript, they do not execute it.

There's some evidence that they are.

[1] http://searchengineland.com/google-can-now-execute-ajax-java... [2] http://www.seomoz.org/ugc/can-google-really-access-content-i...

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