I don't know if I can explain why a review from a patient isn't information that reduces the problem space. To me, it offloads the complexity of the initial problem to another constructed variant.
As analogy, suppose I tell you to only focus on information coming from other corporations about 'big data' and what these organizations are going to do with your data. From that, derive whether their security practices are held at a high standard.
You can't know these things until things proving to the contrary happen. Likewise, I can't know whether my personal experience in a psychologist office is going to be similar or different from another patient - yielding the same results (what is the goal?). Every single statement spoken in the office of a mental health care professional - all of these things matter to the psychologist, and I am aware of that (psychology can't cure neurosis because psychology is neurotic). Every single behavioral mannerism, every quirk, every habit. All 'data' collected, to yield diagnosis. The psychologist themselves might reason themselves out of that belief by telling themselves 'I ignore it, I validate my theories against the science' but the science is mutable because the mind has no set definition that is 'valid' and 'correct' with respect to a standard. They are not God - they do not have omniscience on the definition of mental wellness, mental clarity. I've had counselors tell me it's weird that my 'grounding' techniques are thinking about reality and math. They are not programmers, computer scientists, mathematicians!
It's the same as you worrying about every single statement or bit of information you divulge on the internet. Could be worried about all of it, could shrug it all off. Could go into a psychologist's office and not worry about any of that. Won't, because it fundamentally conflicts with my core values, self identity, principles, beliefs - things I need for my mental health, sanity, security, things that keep my future stable and under my control (being able to reason correctly with respect to code). Conflating all of that with a neurotic obsession over the functioning of my mind? Just as bad, if not worse, as having shit security with data. Data can't predict the future. It's a choice to trick oneself into that belief. That's the problem with these organizations that yields mental peace. Collect all the data they want! It controls their minds more than it controls mine.