It's currently not independent and I'm pretty sure it's a great idea to make it independent, but that is not our main concern now, because angular-js is just a front-end template engine that provides the basic functionalities we need from a JS template-engine. React-js, VueJs, Angular 2 introduce concepts like for example sever-side rendering and that is not something we intend to bring to Hi-Framework, at least now.
Now we focus on the core of the Framework once it's good enough to relax we will see about start engaging in missions like that one you suggest.
But what exactly are you afraid of? What exactly are you looking for? What is the need?