1. Who are you eventually chopinlover or jazzambassador? I do NOT need to study MY jazz harmony because jazz is not my field and I am not at Jazz forum. In Chopin's music this particular combination of D# and D Natural is impossible, so it should be corrected by every literate pianist.
2. Mistakes DO exist in music scores, almost in each edition. These mistakes are not opportunities but real traps in Music. For example, mentioned by me excellent pianist Emil Gilels recorded the 2nd concerto by Saint-Saens with a terrible rhythmical mistakes in 1st movement: he confused Quarter rests (these rests were printed in French tradition, like Eighth rests pointed in opposite direction) with Eighth rests. It was a heavy blow to him, when the others pointed this confusion to him.
The knowledge of Musical Theory gives you a chance to detect these mistakes and correct them. Probably, you are playing only by ear, if you do not know about this fact.
3. If you had an elementary knowledge in Music Theory, you had to know that a quarter note septuplet should have a special sign under or over the group of notes (like bracket) and there should be a special number "7" under or above the "abnormal" in 4/4 group of notes.
If these special sign and number 7 are NOT presented (I did not mention them) - then this is an obvious mistake - the trap for silly pianists, who can not read notes properly.
1. ...dude we live in the 21st century. By neglecting all of the musical developments in the jazz world, you essentially sentence yourself to becoming an anachronism - you're stuck in the past. Look at Gershwin, Ravel, and countless other composers of the 20th Century! They were influenced by jazz. And for the sake of not using Jazz, have you listened to Schoenberg? Stravinsky? How would you feel about Stravinsky's polychords, like F# (or was it Gb? in Petrushka) over C? And even in the music of
Rachmaninoff said dichotomy of F in a D major chord exists, used as a chromatic lead to some other note. (I'm too lazy to find an example, but there are so many chromatic lines you're almost certain to find one somewhere; Op. 23 No. 4 is a good place to look)
3. Not gonna contest this too much, but there are points in Chopin's (and numerous others) where he doesn't write the little tuplet numbers - it's overly cumbersome and everyone knows what you means.
Yes, sometimes the composer is a little ridiculous and dumb. Then just don't play their music. If anyone changed a single note in any of my compositions because they thought it was right (assuming I disagree; sometimes I welcome the changes), I would go absolutely ballistic. It's a matter of preference, at this point. We live in 2017, soon to be 2018. The dissonance is completely emancipated, and the tonal cage of the past has long been shattered (about 100 years ago, actually). Polychords can sound beautiful when used correctly.
There are some parts of some pieces that I would love to change - but then I make the changes, and I realize why the composer wrote what they wrote. Sometimes it's because of voice leading reasons, sometimes because it messes up a climax, the mood just isn't right, there might be all sorts of reasons. For example, in Brahms Op. 118 No. 2, just before the recap, I tried adding a few chords, because I thought it would work better. It doesn't, it completely screws up the pacing.