I think you're right that those "type-A" folks with more rigid minds have some trouble with integration ("catastrophe"/"tragedy"). Our (what I'd call the traditional) approach is very holistic- this path is a whole modality and lifestyle of its own, it's not a haphazard magic pill you do once but a tool to look under the hood every once in a while to see where you're at and what energies are influencing you the most. The earlier sessions can seem catastrophic without the right context (that is, there is usually a lot of low-hanging fruit that comes off when you first come to ayahuasca- you usually have to feel/fully experience these energies to process them before they can be released). You might see/realize that you have a lot of work ahead of you which can be discouraging/overwhelming for sure. More serious cases (long term depression etc) might even want to start out with very small doses (or not at all) and let the ayahuasquero do their work (via icaros, and/or other plants/methods) for a few ceremonies first. (How do you drink the ocean? Sip at a time) In the tradition we work in, drinking ayahuasca is only one part of it. Signing up for a weekend retreat without a well-trained healer can be...counterproductive. The biggest tragedy is casual/new seekers not knowing the landscape- there are many pitfalls and a lot of charlatans, it's probably going to get worse before it gets better with legalization efforts to be honest.