I've never noticed those. If I had I most likely would have ignored them as flaws in the negative.

With respect to pointing out things to people that are not necessarily obvious.

I don't care for noise canceling headphones, primarily because they create a kind of tension that I find annoying. After wearing a pair for 20 mins I feel the same as if I'd been listening to white noise.

When I've pointed this out to fans, typically a few days later, I'm told that they had stopped using them for the same reason.

So, Are you doing someone a favor by telling about that, or not?