This maps roughly to my own use of these labels. However, on the vegetarian example I think you're missing the the primary outcomes that many (the majority of) vegetarians are predicting for. Namely, psychological factors. Most of the benefits of applying these labels to oneself and imposing the constraints to credibly do so result from the community and ego boost (see SSC's A Theory About Religion). Vegetarianism probably isn't a very good diet for most people (although better than the median Western diet, for sure) but it feels good to stand for something and be a part of a tribe. Regarding your last point on the predictive power of religion: it is Lindy. While that's a tautology, the PP framework illuminates the causal driver. Religion captures something innate about us that improves our odds of survival.
This maps roughly to my own use of these labels. However, on the vegetarian example I think you're missing the the primary outcomes that many (the majority of) vegetarians are predicting for. Namely, psychological factors. Most of the benefits of applying these labels to oneself and imposing the constraints to credibly do so result from the community and ego boost (see SSC's A Theory About Religion). Vegetarianism probably isn't a very good diet for most people (although better than the median Western diet, for sure) but it feels good to stand for something and be a part of a tribe. Regarding your last point on the predictive power of religion: it is Lindy. While that's a tautology, the PP framework illuminates the causal driver. Religion captures something innate about us that improves our odds of survival.