There are many ethical implications of playing music exclusively of the past. As is so commonly seen, the oppressors always get to decide what things get to stay known and which things get hidden or destroyed. Because of this, many musical works and styles will have been erased or at least subdued and hidden away and seen as not as important. Another issue with this is that not every culture wrote down their music as some cultures did.
I think I would play without sheet music and explore improvisation and playing more by ear. Of course I would be influenced by the music I have been exposed to until now, but I would do this because I would be curious to know what I can come up with just with me and my instrument.