The angular2 tag is somewhat outdated.
I don't think it is a good idea to make a new tag for every version of Angular 2+ but most questions these days are about Angular 6 or 7. (And soon Angular 8).
We need a tag that identify a question as an Angular question and not an angularjs question.
Maybe it is time to rename the Angular2 tag.
I suggest 'Angular' covering everyting else than 'AngularJS'.
There are differences between Angular 2+ versions, but none that would require multiple tags, unless the question actually belongs on StackOverflow.