When people talk about "therapy" here, they most likely are thinking of bog-standard talk therapy, where you just go in and kinda, well, talk to someone about your life, problems, etc.
For some people, it's enough to just get things off their chest, talk about things out loud with someone and helps them deal with their issues. I personally see such a therapist monthly and find it beneficial to my mental health.
For others, especially those with more intense troubles and traumas, it may not be, and would probably be served better by someone more specialized with said traumas.
Like any medical profession, the quality of individual therapists and mental health experts can vary widely, from chuds to libs to comrades and everything in-between. there's a solid chance you may not get the perfect fit on try 1, I didn't.
I just feel like some people are dipping their toes into Scientology-ish "all therapy is bad, never seek professional help for your problems" stuff, which I think is disastrous advice.
Its just a procedural thing that you do while having issues. Anything can work to do that.
Also, if this 'brain hack' works, then why are therapists necessary? We can just have one video explaining it and get rid of therapists. In terms of clinical results, EMDR has very poor results. I'm glad you got something out of it but most people don't. https://nap.nationalacademies.org/read/11955/chapter/6#99
I've seen multiple clinics advertising in this area that EMDR can 'alleviate 90% or more of the symptoms of PTSD' within just four sessions. I can verify that this isn't true in my case. It just felt like some therapist purposefully triggering me for a thought experiment, each time I went to therapy it ruined a whole month for me which was worse than the normal 3-4 days.