That said, I think many have raised valid points here re: mature pianism (if I may). Quite interesting reading. And to me, certainly Mr Bar-Niv is a seasoned concert pianist - how good depends on your opinion and/or who you hear.
However, I do remember Mr Bar-Niv's first reaction to my (and well, pretty much anyone else's that are similar) not-so-positive comment; "Can you do better?"
Sorry if this reignites anything. I simply find this interesting in that most/all pianists I know/have met, would ask, "why do you think that?" I know of an excellent Beethoven player who, at the end of a Beethoven sonata performance, was confronted with the comment, "I like your 2nd, 3rd, and 4th movt." His next question was, "what happened in the 1st movt?" NOT "can you play the 1st movt. better?"
At least, I'd think that finding out why a certain audience member thinks a certain way is quite a logical task...unless...
I guess that we have the best pianist here

...then obviously there is no place for negative comments. So...
...all hail for the arrival upon the concert stage: [Mr Bar-Niv]!
[Ah, what did I just say? Manners, manners...! ><]
ps. your ideas on the Appassionata are very good! Have you performed and/or recorded this?