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.
Not really.
I started therapy a bit before I broke up with my abusive ex. I had always thought that I had a very good way of introspecting; when there were problems in the relationship I was able to reflect on my actions and improve myself. Turns out I was just being gaslit into thinking everything was my fault, and I needed a therapist who knew what tells of abuse and abuse victims were so it could be clear to me that I was acting like an abuse victim and my relationship was obviously and clearly abusive.
Your perspective on yourself and your actions is not infallible, everyone is prone to biases and blindspots.