Playing at the standard of recordings. That's what everyone wants and expects of performances, at least pianists who are listening to your performance. Pianists who do listen to your performance have x-ray vision meaning they KNOW everything about what you're playing.
This is exactly why Glenn Gould stopped giving live performances.
And I believe you are correct about other pianists... but I do not believe that
all pianists are like this. Because I believe the X-RAY goggles to be a fault. They are not seeing the bigger picture of a performance if they are so narrowly focused on whether a performer is making mistakes.
Too many mistakes is one thing, but the margin of error is too high to be so singularly focused on note clarity alone. Plus, it shows a great deal of arrogance and very little empathy for a performer. And, I don't believe that any one of us can say with a straight face that every performance we've ever played has been crystal clear. So, why do we have the right to judge so harshly? Because we paid for it? That's the equivalent of being a heckler.. everyone is a critic and very few have ever done anything of significance themselves. We shouldn't be so quick to judge. The nerve it takes to play a difficult piece in front of 100's or 1000's of people is too much for most people.
Lastly, you are being fooled if you are comparing live performances to recordings. A recording studio is a controlled environment and the music is ... I hate to say it... produced. Glenn Gould himself admitted that his recordings were almost never one take. He often spliced sections of different takes together to make a whole piece. I guarantee you that recording artists still do this today. So, holding a live performance to that standard is often unrealistic. Can it be done? Sure, but more often than not, even the best pianists in the world will duff a note or two. Music is much easier to nail when there is no pressure on you to hit it in one try.