Shame of using it? No. But it is usually the second option. I first try to have a visual contact with one of the crew members. Once pressed, the answer varies a lot… In economy, little chances to get anything. Plus with these cramped seats now, too often it is pressed by accident. In business, the odds are higher. But, yes, it depends on the airline. In First, it has to be fast, as we should not have to press that button there!