> Piano music is mostly written by right-handers for right-handers
Even if that does not directly say that people (right-handers, specifically) insert their handedness bias into the things they write, it does certainly imply that that is important for people who write piano music to put the athletic part (the melody) in the more dextrous hand. It is not. The reason for the right hand to carry the melody is the sound projection of high notes, nothing to do with handedness.
Incidentally, many famous composers in the piano canon were lefties. Rachmaninov, Prokofiev, and Ravel all have strong evidence of being left-handed. CPE Bach may have also been a lefty, as may have Mozart and Beethoven. This is not "right-handed people making right-handed music" by any means.
Even if that does not directly say that people (right-handers, specifically) insert their handedness bias into the things they write, it does certainly imply that that is important for people who write piano music to put the athletic part (the melody) in the more dextrous hand. It is not. The reason for the right hand to carry the melody is the sound projection of high notes, nothing to do with handedness.
Incidentally, many famous composers in the piano canon were lefties. Rachmaninov, Prokofiev, and Ravel all have strong evidence of being left-handed. CPE Bach may have also been a lefty, as may have Mozart and Beethoven. This is not "right-handed people making right-handed music" by any means.