What I would like to be able to do is write XQuery on both the server and in the browser. The Sausalito made that promise, but it just never felt quite right to me.
Having been raised with MVC back in the 1990s in C++ and Java, there has just been something about AngularJS that has totally clicked with me. I can take a bit of the load of rendering pages away from the XML database backend and use static HTML pages in the dynamic fashion that was promised since Netscape Navigator 2.0.
It's been nice doing everything in a single language - XQuery - for the past several years. The Model is XML, the View is XHTML and JSON output, and the Controller is XQuery. All of it running on the server side.
The division of labor in AngularJS feels right to me. It's organized well. (Part of that organization appears to be a reliance on Node for project management. So understanding Node is useful, even if you're not going to be running from a Node HTTP server.)