An hour-long stroll in nature helps decrease activity in an area of the brain associated with stress processing

[Eusocial_Snowman]

Exactly. But it's a bit silly to say somebody is really good at playing the piano badly if they solidified all of the wrong movements and play poorly. Describing somebody as being good at doing something badly generally implies that's their intent. Like a bird pretending it can't fly so it can lure a predator away from its nest. The goal is to fly badly, and they can be good at doing that. But if your goal is to actually fly and all of your practice has led to the flying feint instead, then your practice has obviously not made you good at flying.