No, not implying that everyone is fearful or untrusting but, if you look through the posts, there are many who are. RRL has never (and will never) be "proven" do do what is rumored. As with things like castor oil "induction", curries, pineapple and bumpy car rides, we will never know because everyone goes into labor in the end and it is impossible to know what might have helped (or hindered). It will never be possible to do Randomized Control Trials on RRL as we cannot obtain consent from the fetus.
The component Fragrine is an alkaloid, like Caffeine. Alkaloids are poisons. Most herbal medicine was developed to alleviate symptoms of sick people and the trade-off between risks and benefits was acceptable under those circumstances. However, pregnant women are not sick and don't need "medicine" to help a natural process. We are better off sticking to whole food, fresh and local organic for preference, or if something like Iron is needed, take something which gives quantifiable results (such as Spirulina). By the way, Vitamin C is destroyed by heat so that particular benefit is probably negated in the tea form of RRL.
The language used in websites which tout the purported benefits of RRL is vague and unhelpful. Words such as "calming" "soothing" "toning" "strengthening" and "easing" are used but without any evidence to support these claims. Some people recommend not using it before 36 weeks due to the risk of preterm labor, others say get in early to strengthen the uterus. This alone should alert us to the lack of real information surrounding this plant. As an aside, for those who are considering the Cohoshes (similar names but different plants) avoid the Blue and be very cautious about the Black. Neither, in my opinion, is necessary for normal pregnancy and birth and both can have unwanted effects on the body. Similarly, castor oil stimulates the gut (this is proven) which may stimulate the uterus, but at what cost? Babies often get distressed from the painful spasms provoked in the mother and, worst of all, after a few hours of painful contractions, it can all die away again with no result other than a tired, frustrated mother.
The best thing I can say about RRL is that it is probably harmless physically but, after many years as a midwife trying very hard to look at things rationally, I would have to say that RRL has not shown itself to make any difference whatsoever for the women I have cared for. However, I am well aware that in the realm of pregnancy and birth there is a lot of mystique and variability in beliefs so I have no doubt that many women will just take it anyway.