Most programmers are familiar with the common notations for nested structures (e.g.: a dot, or a slash). Mustache's solution requires a programmer to explicitly reference the parent context:
https://github.com/defunkt/mustache/issues/issue/6#issue/6/c...
BTW, jQuery-tmpl is supposed to become "jQuery/DOM" free in a few, which allow to use it on the server-side as well (assuming Javascript).