At least in Western classical music, there's a lot of emphasis put on Urtexts (scores that contain exactly the information the composer wrote and no more), composer intent, distinguished voices (stem up v down), diatonic scales (enharmonic choices matter), etc. This would make it nontrivial to simply switch notations.
In some sense it's like saying "finally, I can read Don Quixote in whatever language I want because of Google Translate!"