I’d like to be able to trust that my doctor has had training, and can provide proof. That’s the case 100% of the time. Licensing boards accomplishes this.
There is literally no case in which I’m willing to accept some self taught doctor, so why wouldn’t we want licensing?
I am not saying we don't need licensing. I was saying second opinions can be helpful in making an informed decision. I have gotten bad advice from licensed people before as well.