Is it necessary to get template ref dynamically?

I declare a summary template in Base component. In form component, I have four tabs, when user clicks the last tab, I render the summary template. Is it necessary to get summary template ref only when user click the last tab? Any advantages?

In Base component

  <ng-template #appSummary let-summary>xx</ng-template>
  getAppSummaryRef(): TemplateRef<any> {
    return this.appSummary ;
  }

In form component

constructor(){
  this.lastTab$.pipe(distinctUntilChanged()).subscribe((summaryTab: any) => {
      this.summaryRef = !!summaryTab ? this.baseComp.getAppSummaryRef() : null;
    });
}

Or just

constructor(){
  this.summaryRef = this.baseComp.getAppSummaryRef();
}