Whatever you call it — being mindful, chill, meditation, calm, relax — it’s good for you.
It’s a bit like eating blueberries. It doesn’t matter whether you eat them because you like the taste, or because they are good for you, or simply because you are hungry and that’s what is available.
You don’t have to know the reasons why they are good for you, or even that they are good for you. Eating blueberries improves things.
The same is true with being mindful, chilling or whatever you call it. Sitting on a pier watching a sunset can improve things.
I think listening to music can improve most things, including our stillness.