Treating less severe forms of anxiety with CBT is going to be a lot more successful than treating deeply rooted personality disorders using any modality. Some problems are more suitable for CBT, and others are more suitable for EMDR, etc.
Just chatting to friends isn't enough unless you're just dealing with relatively mild, garden variety loneliness, depression, anxiety, or something similar.
Here's a 2.5 hour session (split into several videos) with a doctor who has a bad relationship with his son and felt like a failure for it:
https://www.youtube.com/watch?v=42JDnrD106w
https://www.youtube.com/watch?v=S5H2YGljhqQ
https://www.youtube.com/watch?v=bZ9_0j_fmeg
https://www.youtube.com/watch?v=eiCrdGVa8Q0
https://www.youtube.com/watch?v=cARvhlTckaM
Here's a couple of hour session with Marilyn who was diagnosed with lung cancer and spiraling with depression, anxiety, shame, loneliness, hopelessness, demoralization, and anger, despite her successful career:
https://www.youtube.com/watch?v=S7sQ_zDGsY8
https://www.youtube.com/watch?v=tyuFN4mbGZQ (there's probably more parts to find through YouTube somehow)
And a session with Lee with loneliness and marriage relationship problems:
https://www.youtube.com/watch?v=imEMM3r6XL8 (probably more parts as well)
It's like saying "it is still debated if debugging even works" as if all languages, all debuggers, all programmers, all systems, are the same and if you can find lots of people who can't debug then "debugging doesn't work". But no, you only need a few examples of "therapy working" to believe that it works, and see the whole session to see that it isn't just luck or just the relief of talking, but is a skill and a technique and a debugging of the mind.
But a patient feeling better at the end of a single therapy session doesn't prove that therapy works either...
- Does the patient feel better between sessions too? Will they keep feeling better after the therapy ends? Aka are they "cured"?
- Would the patient feel equally good if they confided in a non-licensed therapist?
- Do the techniques (CBT, DBT, ACT, IFS, etc) actually provide tangible benefits versus just listening and providing advice?