I'd say the language design and language ecosystem has a LOT to do with it as we...

I'd say the language design and language ecosystem has a LOT to do with it as well. Here are a few lines of Java that I just had to write about 10 minutes ago.

  PendingResult<MessageApi.SendMessageResult> pending = Wearable.MessageApi.sendMessage(mGoogleApiClient, mWearableNode.getId(), path, data);
  pending.setResultCallback(new ResultCallback<MessageApi.SendMessageResult>() {
      @Override
      public void onResult(MessageApi.SendMessageResult result) {
          ....
      }
  }

Okay, now suppose this were a Python-based API instead? Perhaps it could be something like this, after some relevant initialisation:

  wearable.sendmessage(mywearable, path, data)
  
  @wearable.onresult
  def onresult(result):
    ...

Tell me which one is more in need of commenting.