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If I understood it correctly, this framework is only used for the mobile site.

I can hardly think of any other well-known website that is more complex than Facebook. Every little screen space is used, you can click anywhere and it has hundreds of millions of users.

Compare the Facebook interface to the Google Interfaces and you know what I mean.

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Because google wasn't able to build anything complex with JS, like say, a document editor that synchronises changes across multiple clients.

Technically, Writely built that editor, and Google acquired Writely.

Google Spreadsheets predates the Writely purchase and in any case, that purchase was in 2006, 6 years ago, so almost certainly Google Docs is 2-3 code rewrites past whatever the Writely team wrote.

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