Angular 信号 使用 mutate() 与使用 forEach() react 性

考虑到下面的Angular Signals个示例，我有点困惑，当数组API(如forEach)足以触发react 性并更新UI/模板时，我何时应该使用信号API(如mutate()和update())？这里有什么不同？使用的Angular 版本:16.0.1

@Component({
  selector: 'my-app',
  standalone: true,
  imports: [CommonModule],
  template: `
    {{usersList() | json}}
  `,
})
export class App {
  usersList: Signal<any> = inject(UserService).getUsersList();
  constructor() {
 
  }
}

bootstrapApplication(App);

@Injectable({
  providedIn: 'root',
})
export class UserService {
  private users = signal([
    { id: 1, name: 'Peter', country: 'USA' },
    { id: 2, name: 'Party Boy', country: 'USA' },
    { id: 3, name: 'John Connor', country: 'USA' },
  ]);

  constructor() {
      window.setTimeout(()=>{
        this.changeUsersListWithoutMutate();
      }, 3000),

      window.setTimeout(()=>{
        this.changeUsersListWithMutate();
      }, 5000)
  }

  changeUsersListWithoutMutate(){
    this.users().forEach((item) => {
      if (item.id === 1) {
        item.name = "changeListWithoutMutate";
      }
    });
  }

  changeUsersListWithMutate(){
    this.users.mutate((data) => {
      data.forEach((item) => {
        if (item.id === 1) {
          item.name = "changeListWithMutate";
        }
      });
    });
  }

  getUsersList() {
    return this.users;
  }
}