Psychotherapy is about the relationship. This point is of such importance, that in Germany (where psychotherapy is covered by the mandatory health insurance) patients are allowed to have a couple of test sessions with several different therapists and then choose to continue with the one they feel best.
Also - as already pointed out - there’s a multitude of schools or types of psychotherapy (CBT, Psychodynamic, etc.) with statistically significant benefits. Of course, some are more suited for some cases than others. The OP treats psychotherapy as a monolith.
One way to look at it, is, that many people weren’t raised with competent-enough parenting (or mentoring) to acquire the skills to cope with some issues on their own - i.e.: the “just deal with it”. And this is the role of the therapist: not to become a parent, but to play the prosthetic role of a very competent parent, or mentor. So that the patient can increase self-awareness, self-reflection, and emotionally grow into being able to better deal with the situation at hand.
However, perhaps the biggest takeaway message here is that we need to educate Society - as we educate kids to learn to recycle - on how to choose a good therapist, what good therapy feels like, the importance of accredited and evidence-based methods (so people don’t rely on astrology and other quacks for - and therefore avoid properly dealing with - their emotional health needs), as well as, what should NOT happen in therapy sessions.
PS: And also educate about what is black & white thinking ;)