Ah, did not know you were a conductor. Wow. You are living the dream
So I guess I can ask you about my favorite question/pet peeve regarding composer intent….
Repeats of the exposition when explicitly called for in the score? Dispensable options or sacred canon?
And regarding period instruments Yes, I know exactly of what you speak. My favorite recordings of the nine are the Karjan 63 set which is of course with modern instruments but I do enjoy the recent Roger Norrington ones with period instruments and a classically sized orchestra
But I think you hit the nail on the head with your choice of the word „ego“ for this conductor. I view it as arrogance to think there is something more that needed to be said in the ninth. Who really has the right to say that? Only Beethoven himself