One can never play a piece perfectly. Rubinstein makes 1-2 mistakes per sonata? That's total bogus. Perhaps 1 or 2 wrong notes, but a correct note played wrongly is still a mistake isn't it? Piano has MULTIPLE dimensions, dynamics, phrasing, articulation, pedal, voicing, balance, color, expression, rubato, etc. etc. With these, wrong notes are the LAST thing experienced pianists worry about.
Perfectionism is impossible in music. However, that doesn't mean you should settle for less. Instead, we as pianists must strive to get to perfect as humanly possible.
And on top of being perfect, if one cannot communicate what they feel about the music to the audience, the music loses it's meaning. Music is meant to be shared and as musicians practice in order to better communicate the music rather than to iron out mistakes.
As for wrong notes, one should avoid them as much as possible, but they do happen and then if they do, just move on. You could play something with no wrong notes at all and it would still suck. On the other hand, you play lots of wrong notes like Horowitz and still blow away the audience regardless of whether they like the piano or not.