This issue is part of the reason I'm a family doc and not OB - I became convinced that I couldn't make it through the residency doing all that unnecessary stuff.
That said, I still regret some of my training experiences. I don't think I ever did a procedure myself simply so that I could do the procedure, but since I trained in such a medicalized environment, I did some things that I thought were necessary that I know now weren't. And there were certain things that I absolutely could not change because I didn't have the power to do so, like continuous monitoring. It was not within my power to choose to use intermittent monitoring, or to limit cervical exams, or many other things.
I got myself into trouble more than once for doing things differently, though. Once, I was helping a medical student to catch his very first baby with a lovely first time mom who had labored beautifully. The medical student was also a very lovely person, and had been very supportive and helpful with this mom and was just in awe of her ability to birth her baby, so it was as nice a training situation as you can have (although still, how absolutely awful to have to birth your baby with a medical student and a medical resident you've only known for a few hours, in a horribly medicalized environment where you are tied to the bed with numerous wires. Blech.) Anyway, as the baby was crowning nicely, the attending OB who was required to attend all births came in the room and started screaming at me like a banshee that I needed to cut an episiotomy right away. This poor mama was in a nice labor groove, and pushing when she wanted to, and suddenly the atmosphere went from loving and supportive to frantic and argumentative. I argued with the OB for a while, and since she didn't have gloves on, she couldn't move fast enough to take over. "She'll have scarring for life! The baby is just ramming his head against the perineum and will be damaged! Why are you just staring at me stupidly, cut now! Cut now!"
I turned my back and drew up some local very, very slowly, and while I was still messing around the student said "Um, doc? Um. The head seems to be out?" So I just turned back around and helped him not drop the babe on the floor. No epis. But she did have a small second degree tear, which was easily repaired.
That OB didn't let up all shift either. She wouldn't let me do any more teaching or catching, and spent the whole day lecturing me on how I'd just probably caused this mom and baby permanent damage. The only reason I was able to put up with it was that I had already done a lot of research on my own (and also birthed my own first 3 children already) and I knew she was wrong and someday I'd be in a position where I didn't have to listen to that kind of thing. I argued with her all day, but I know I never changed her mind one little bit.
I still feel bad about situations like that, and all the births I witnessed that were so traumatic. In general if someone above me wanted me to do something I knew didn't need done, I would refuse. Frequently, I worked with some nicer supervisory docs who would tolerantly "let me try it my way." And I even had 2 OB attendings who truly didn't believe in unnecessary procedures like episiotomy or instrumented deliveries. It would make me ill to hear an OB resident saying to a supervising attending "Room 4 has a dense epidural. What do you say we put on forceps?" And then that mama would have forceps so the residents could practice, and probably end up with a horrible extended episiotomy also.
I still don't know if the ends justify the means. It is very hard to get through modern medical training and there is a lot of pressure to do things the standard medical way. I feel bad that I couldn't protect so many women from unnecessary interventions, and yet I wasn't in a supervisory position to protect them. I don't know still if there was any way to change things - like reporting the unnecessary forceps routine? I think it would have been very easy for the docs in question to defend themselves that way in our medical legal climate.
Mostly I just feel bad that standard medical care is what it is. And that I didn't realize along the way that even many of the things that I thought were inevitable parts of having a baby were actually interventions that totally changed the birth experience for so many mamas.