Thank you for your answers! I agree that we should be learning what each piece can teach us, but can't we take up "bad habits" playing a piece too early on? For instance, that chopin ballade I mentioned, isn't it counterproductive to tackle this piece when you are not ready, thus memorizing mistakes (not just wrong notes) that later will be very difficult to forget?
you forget there are different ways of playing piano. By looking at your hands (you can always retrain your hands) by thinking and analyzing (you forget things even if you know the entire piece, so you can easily learn new things) and by learning away from the piano/applying what you learn as soon as possible after taking in new information. Mistakes are nothing, they are not detrimental to success. If you think they are, if you think that way....you will never get over butchering a piece...
Can you please explain what do you categorize as mistakes? For me, mistakes may be incorrect phrasing, a harsh tone due to lack of technique, wrong notes, I dunno... The whole idea of the piece, the way you see it. Sometimes when we're young we don't have to capacity to comprehend what we are playing. We do not ask ourselves why do we do it this way, and not the other. And from experience from all of my teachers, once it's there, it is very difficult to change. It gets stuck, that idea, that logic and muscle memory. That is why every time I start a new piece I play painfully slow a couple of times. It is crucial to avoid bad habits.
no, some things only time can fix. You can't just fix a harsh tone. My first teacher said to me, tone takes years. People get jealous of people who naturally have a good tone. However, there are so many nuances that have to be taken into account, that it is job that can only be done subconsciously. Which starts with becoming aware of your mistakes, or tone, or phrasing. Or, simply...just improve on everything, always. Yes, a piece is never done. There are so many ways of playing one piece. Which means, there are better ways and there are worse. Style and taste can be overwhelming. But bad habits are nothing. They can be smoothed out. However, I do not know who I am talking to. I have an insane amount of patience and enthusiasm. And pain thresh is pretty high, too. I love to learn, at any cost. If I find that I have a bad habit or a lack in clarity or what-have-you, I will find a way to manage this, and eventually move forward. Or, just think and do.
Listening to a piece is not how you learn to interpret written music and test everything you know about reading and learning music.