Coincidentally, Angular is going to deprecate IE11 support with Angular 12, and remove it with Angular 13
https://blog.angular.io/angular-v12-is-now-available-32ed51f...
https://blog.angular.io/angular-v12-is-now-available-32ed51f...
There are enough sites out there still using it in production that I'll be surprised if nobody steps in to pick up development.