Ask HN: Why is coil whine in electronics so prevalent?

I’m talking about the whine, buzzing and similar noises. Here’s an explanation of how they happen: https://www.youtube.com/watch?v=4D6PKusyvUU . Now, I’ve heard of some simple DIY remedies that work, like putting glue in/around the inductors. So, I want to know why this doesn’t get properly fixed in the manufacturing process. Because nobody cares? Is it too costly? I wouldn’t mind paying […]