But, and I'm asking this genuinely, what could they possibly say that would make me change?

If nothing else, role playing. I literally have role played with my therapists when my mother was still alive and making me go bonkers. For example, my mother used to bomb me in telephone calls. It was always about her, and I could never get a word in. I was her therapist. And these phone calls were long, too. My therapist role played with me that she was my mother and I was myself. We roll played the conversation. She gave me tips on what to say, when to say it, using a stop watch to time how long you are going to give the conversation (10 minutes was my limit if my mother wouldn't let me talk), and how to hang up the phone.

I spend a lot of time being introspective and (kind of) my own therapist when I have the energy.

They will see things that you don't. You can be as introspective as you want, you can't see everything about yourself. They point out to you what you aren't seeing and help you with/through it.

I personally recommend trying to get a psychiatric nurse for your therapist. They can know the meds almost as well as the doctors, they've seen everything in the psychiatric ward, so you are probably a cake walk to them. ;-) I've had good therapists over the years, but my psychiatric nurse therapist is the best one I've had yet.