I have been using the Umbraco CMS since 2013, and they moved from AngularJS 1.x to Lit for the backend technology. While it was frustrating at first, due to a lack of documentation around the specific CMS APIs, I can see that it was a great choice to move towards a more "standard" technology that is somewhat agnostic of a full library. Working with web components makes so much more sense to me than the way AngularJS works, as well as the React and Vue tutorials I've followed. If I found a killer feature implemented in React or Vue, I could still make use of my Lit web components without having to toss out everything and rebuild.