The discussion is very long and would require multiple replies.
I would like to take the liberty of starting to talk about Chopin.
Rivers of ink have been written and thousands of hours of music have been carved out on this author.
We could also not care about Cortot and Rubinstein....but, for example, Cortot provides us with certain elements regarding how Chopin wanted his Music. Cortot was a pupil of Matthias, a direct pupil of Chopin, the only one, perhaps, truly gifted and professional. This is because it must be known that Chopin did not have "important" pupils. In his short life of 39 years, especially in Paris, he had to deal with his finances and strive, nonetheless, to maintain the "bon ton" of Parisian salons. His pupils were mostly "young ladies of good family" " who would place the envelope with the fee " while the Maestro, with his back turned, looked out the window". However, we have many certain indications from Cortot, precisely in his book (which I strongly recommend reading) "Some Aspects of Chopin". Two fundamental elements belong to this great Author: "rubato" and "the classical vein".
Let's start with the latter. Chopin was a classicist. I repeat: a classicist. He knew Bach's "well-tempered clavier" very well and knew several preludes and fugues by heart. Over time, he was extremely rigorous. It seems that during a lesson on his second scherzo in B minor, the pupil could not get beyond the first two triplets! At times, despite his frail figure, he would fly into a rage and demand temporal rigor (once he broke a chair).
In contrast to this, Chopin is the Master of "rubato". What is rubato? Rubato is an oscillation of rhythmic figures WITHIN time, a sort of "ebb and flow" WITHIN time. A sort of "controlled freedom" of the musical phrase that finds itself within time. Once, a pupil asked Paderewski what rubato was. He took him into the garden and told him to observe the tops of the trees which, swaying in the wind, returned to their position. "There—he said—that is rubato" (a beautiful poetic vision of a Great man,... who nonetheless did not want to deliberately explain to the pupil what they should seek and find!)
Chopin used to say: "think that your left hand is the conductor and play the right with great freedom. ...But how is it possible!!!?????" Rubato offers this possibility. It is very difficult to "understand" and perhaps takes years, but it is fundamental to playing Chopin.
Let's stop here for now.
You see, it is not so much a matter of "how we feel", nor even of rigorously following the precious indications of our predecessors. I would say that a philological vision helps us fulfill our "duty" as Musicians, which is certainly not to satisfy others, but rather to be able to "present" with "coherence" the Idea that the Author has left us in code, interpreting it beyond the "limited" signs" .....even discovering some "secret thought" (Chopin's words). But all within "stylistic respect". It is a matter of deciding whether to present the Music or to present oneself.
The "relative", which today is very inflated, encounters many narrowing boundaries, while still leaving our creativity a good margin for decision-making.
My idea, therefore, is not to fail to reward Simone's magnificent performances and/or Gennaro's profound considerations. I do not, however, agree when I hear Music and Art in general defined as a place where everything is possible, where everything can be right or wrong, where everyone can do everything. I could bring other examples here of my convictions regarding Theater and Painting. Instead, I invite you to find those "Values", those "points of reference" that we seek so much and find with difficulty. I am very afraid that "individual loss" will increase, generating confusion. I find increasing difficulty in marking "milestones" that increase the baggage, the well of knowledge, and lead us a little more by the hand toward greater objective discernment.
Do not be angry with me. I am an admirer of personality and a supporter of individualism. I do not want with these words to absolutely diminish or offend your precious and interesting point of view.
We will continue to develop the discussion, I hope........
Always with Music....in the mind and in the heart
Thank you for your patience
Paolo