Why didn't I add multiple middleware at a time?

I kown you can add function `addAll` to MiddlewareBuilder. But I have found it in MiddlewareBuilder. Why not add this function. I don't want to invoke `add` function every time

example
```bash
Map<ActionName, MiddlewareHandler<HomeState, HomeStateBuilder, HomeActions, dynamic>> other ={
  HomeActionsNames.homeIncreaseAsync:_homeIncrease,
};
MiddlewareBuilder..addAll(other)
```