alt Hacker NewsSimilar to you, I don't see the attraction of these sims.
I have a theory it is a mindfulness thing like many hobbies.
Think knitting or crochet or even building and running a model train set in the garage. These things aren't terribly hard once you learn the basics but you have to pay attention to various details over time and it allows you to tune out from the rest of the world when you want to.
But I really don't know.
A mind is slightly different from a body in that it really does not understand the concept of "off". It is movement by its very nature. Even its relaxation is expressed through activity. Simple repetition and continuous low-level positive feedback is a way for it to rest while moving.
At least, that's my working model of it.