I agree with you in the benefits of being "actively engaged", but at least for me I would add two points.

They don't need to be productive activities, like cooking. Some people feel like they have to be productive even in their free time. It's fine but there's no need. And if you like learning an instrument without the intention of joining a band, that's perfectly ok.

Also, you're allowed to be bad at it. It's just a hobby.