Things that don’t get concrete results for people tend not to survive 2000+ years, like meditation, taichi/qigong/whatever; so i don’t think some things really need scientific proof. Even then, how do you scientifically prove if something makes you feel better who really cares if it’s x or y receptor or brainwave pattern or whatever?
Astrology is more than 4000 years old, what concrete results did it provide?
Forgot the ground rhino horn to make your dick hard. What's the thing shark fins are supposed to do? I can never remember.
Prayer has been around a lot longer than that, and no objective blind tests have ever been able to prove any verifiable results.
Longevity of ideas is not correlated with usefulness. Our belief systems are not optimized; they are, like genetic evolution, just 'good enough' to allow survival.
Like, praying? Or maybe one feels good after sincere prayers, perhaps…
This is simply an "Appeal to Tradition" fallacy. People do lots of things for thousands of years that are worthless, wrong, or pointless. However, this also doesn't mean that just because we've done these things for a long time that they are in fact pointless.
There are methods to prove subjective things like "feeling better." There is in fact a lot of research that shows that meditation and exercise like Taichi is good for you.