I tried to justify some of my hobbies to see if I could come up with anything that couldn’t be called a “rationalist hobby” to determine if it’s a useful designation or not.
Knitting—Trains your attention to fine detail. After you knit a pair of socks, whenever you wear knitted clothes you’ll instinctively think, “I could make this. There are no great unknowable secrets in manufacturing, only time and labor.”
Music Radio DJing—You learn how to speak fluently and without pause, and put together an entertaining set of music, which are both useful for signalling in social situations.
Reddit—Its up/downvoting system teaches how to quickly decide whether or not something is interesting to you, and the ability to submit content to be judged by the crowds can train your ability to write short copy that will appeal to large audiences.
I feel like I’m stretching, but also like science fiction, video games, chess and poker are probably also stretches.
Heavier than air flight? Yeah like that will work. Let me just get in my lead balloon.
I don’t see much merit to this idea.