Cyrille, I had to disable them because these Unicode characters, like emojis, are made up of several bytes and the encoding/decoding often breaks when sharing songs between devices and when posting them on the forums.
I would have to come up with a new way of sharing songs/playlist which would not be backward compatible. This is too high of a price to pay for such an edge feature, but I'm aware of it and it's in my notes and will be implemented if I ever I decide to do such a major change to the sharing format.