“In fact, backwards compatibility was not even a consideration ” is not 100% accurate. NgUpgrade is a thing. There is at least one book about upgrading from AngularJS to Angular. Backwards compatibility wasn’t possible because of security holes in AngularJS which they took seriously at Google. But the Angular team at least provided a bridge for upgrading from AngularJS to Angular.
“In fact, backwards compatibility was not even a consideration ” is not 100% accurate. NgUpgrade is a thing. There is at least one book about upgrading from AngularJS to Angular. Backwards compatibility wasn’t possible because of security holes in AngularJS which they took seriously at Google. But the Angular team at least provided a bridge for upgrading from AngularJS to Angular.
I will make an update to the article to address this. Sorry for the misinformation!