This might be important, like a form of therapy based on counselling, thinking or talk seems beneficial for success of drug based psychotherapy. Whether it is better, we should learn properly and not assume. If it's not, we're wasting time. (Or perhaps it works better for true believers, that's an important thing to know as well.)
It is good to remember though that these approaches exist, and to let them be practiced safely and openly. As well as researched without interrupting it.
A tour guide does specific things.
We could know what makes for a good or bad one.
Is a person who fakes the practice as good as a native life long taught shaman? Which kind of shaman is best? Is tailoring the experience needed and in what way? Etc.
Wouldn't the data we have on mental health show that contemporary wisdom on its treatment is failing? Given spikes in rates of anxiety and depression over the past century, among other adverse effects, this isn't an unreasonable conclusion to make.
That said, maybe it's more important to look at how these have been dealt with in the past than the data we have in the present.
The spike can just as well be caused by bad environment we made for ourselves, ecologically and psychologically.
The problem is, we really do not know what we're doing when dealing with mental issues. Typical western approach is only slightly better than dosing people with random psychedelic substances of mostly unknown effects. The science done in field of psychotherapy is low to non-existent quality. Methodologies are in their infancy.
Of course. Ergoloids have a long list of side effects, which is why they're considered outdated or third line treatments for many illnesses. But not others, say for severe migraines, they're still best or first line available agents.
Shamans are more like tour guides. Walking you through your own experience.