Dear Keypeg:
Thank you so very much for caring because you genuinely do. Also, as I have alluded to before, this is why I find these types of posts highly suspect because they smell of self-promotion.
Nevertheless, let us take the OP at face of Arthur Rubinstein as a regular person that one could form a relationship off of a chance meeting on the street.
Parenthetically, it took me from the year 2000 (until four years ago) to confirm my thesis of original performance practice. Until that point in time, as a philosopher I questioned/devil's advocate/challenged everything that I had ever been taught.
Regarding the credibility of Arthur Rubinstein, he stated (in his first book) that he would never perform in Germany because of the Kaiser's invasion into Poland. Yet, his recent family's documentary (featured prominently on this Website) was entirely a German production, including his speaking entirely in their language. Hey: money talks?
On point, Rubinstein, Gieseking, Backhaus, and Arrau, never had a teacher as an adult. Please name me one alive concert pianist (Brendel is lying) that never had a lesson/significant coaching as an adult. Would any of you or any teacher you personally know or heard of who would ever recommend this pathway to successful matriculation at the piano?
They, like Andres Schiff (Utchida) sight-read most of their recordings in the studio. Earl Wild states in his Memoir that Gieseking had never even played half of the Mozart individual piano works prior to his recording the entire set. Hey, the man (Wild) was there recording at the same time, and his surviving partner Michael Rolland Davis can back it up and then some (ivoryclassics.com).
Finally, I list, which has been widely ridiculed/denigrated in the past, links to live recordings as to how the piano was originally played. These are pianists, both of whom studied under students of Chopin, enjoy:
Please notice the playing the bass note slightly ahead of the soprano in order to accentuate the melodic line, the definite rolling of chords, and the modification of tempo.
And finally, here is the great Rubinstein's (sight read) recordings of these same pieces.
You decide between a man who never had a piano lesson after the age of sixteen, and then two of the most widely recognized Chopin specialists of all of time whom, as aforementioned, did study these pieces from students of Fryderik Chopin!
As a suggestion, you and your ears decide, and not your teacher mind and ears,