<div *ngIf="(user$ | async) as user">
  <!-- In this div you do not need  to put async pipe to all variable -->
  <h2> {{ (user$.name }}</h2>
  <!-- Without the user variable the syntax of async pipes could be heavy -->
  <h2>{{ (user$ | async)?.name }}</h2>
</div>
<div class="other-div">
  <!-- In this div user is not defined as it is not in the ngIf conatainer -->
</div>