If an async returns actual Future the result is NOT a nested Future but a flatten to mere one.

async_returns_future.dart

String customerOrder = 'Large Latte';

Future<String> delayOrder(Future<String> order) async {
  // I HAVE TO WAIT THE ARGUMENT FUTURE FIRST OR ELSE
  // AFTER THE EXPIRATION OF THE INTERNAL FUTURE, 
  // ARGUMENT FUTURE WILL BE EXPIRED TOO. (NOT A BUG)
  String strOrder = await order;
  await Future.delayed(Duration(seconds: 1));
  // return await order;
  return strOrder;
}

void countSeconds(s) {
  for (var i = 1; i <= s; i++) {
    Future.delayed(Duration(seconds: i), () => print(i));
  }
}

Future<void> main() async {
  countSeconds(4);
  print('Awaiting user order...');

  // This IS 4 times delay.
  var order = await delayOrder(
    delayOrder(
      delayOrder(
        delayOrder(
          Future.value(customerOrder),
        ),
      ),
    ),
  );
  print('Your order is: $order');
}