Why are Angular 2 or Angular 4 using parentheses for bananas? Is there any specific reason for this? Why won't they follow the same pattern as Angular 1?

Question

I know this is not related to any encoding, but they can follow the same syntax as in Angular 1

<input ng-model="hero.name" placeholder="name" type="text">

AngulAR 2 and its larger syntax are still

 <input [(ngModel)]="hero.name" placeholder="name" type="text">

If they do, would it be very helpful if people adapt the changes in Angular JS?

Similarly for ng-repeat they changed to ngFor

<ul ngFor let-item [ngForOf]="items" let-i="index" [ngForTrackBy]="trackByFn">
  <li>...</li>
</ul>

<ul ng-repeat="item in items track by myTrackingFunction(n)">
<li>...</li>
</ul>

Answer 1

Banana braces are for double binding.

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Answer 2

... [()], angular. . [] setter while () getter, ngModel.

Setters [] , .

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