Also, I don't contradict your experience.

I assume that some things can have positive impact on many people, and at the same time a larger negative impact on a few people. In such case, many people would recommend it based on their personal experience, and yet the experts would not recommend it. Which, I assume, could be this case. And also case of many other recommendations promoted online, or even in this thread.

After reading the other comments, I am now pretty uncertain about the rheumatism. But even so... the benefits of this therapy seem rather small, so I don't see a reason to take even small risks.