Since the composer has said everything, if you discover everything, it will be enough and you will be a happy man. Don't try to say it's your taste, and because of that you are changing this or that. And I must say this respect is still there.
The message of music was also the first thing what I learned from my first teacher. She was an organist too and she was very devoted to what she played, so she had a respect for every piece and she felt that she is not allowed to add something of her own.
I worked on scores. I went to the musical library in Berlin which is very famous. I discovered that we had scores of Beethoven, printed scores of Beethoven, that are full of mistakes. Not the wrong or false notes, but the wrong dynamic, understandable things.