Author here! The solution I'm proposing does not assume the data is local to the user's machine. In the video attached to the blog post, a web application is a

Author here! The solution I'm proposing does not assume the data is local to the user's machine. In the video attached to the blog post, a web application is authorized to access a database hosted by a different service/domain. While the blog post covers collaboration/social data as current limitations, I'm curious what other classes of web apps you think don't work with the proposed approach?