well actually my company has a mixed Angular+AngularJS application. AngularJS really sucks compared to Angular. Angular is a extremely polished framework. Howev

well actually my company has a mixed Angular+AngularJS application. AngularJS really sucks compared to Angular. Angular is a extremely polished framework. However the size is a problem.. Currently upgrading from 5 to 6 was simple. We didn't need to upgrade 'angular' code. (we just used https://update.angular.io/ https://update.angular.io/) basically took me two hours (replacing all rxjs code) (code base is 35k lines of typescript and 14k lohtml) The biggest pain between 5 and 6 is basically rxjs not angular per se and for that there is rxjs-compat. However the only problem with angular would've been if people would've used the old Http Client, however we started with 4 and directly used 'HttpClient' which also is way better since you can easily have interceptors around it.