Ah the "great preamp vs no preamp" question.But why turn it into something else again with more colorations, it’s not what the maker of that piano specifically wanted you to hear. "Otherwise he may of added a tube sound board🤦♂️" and then called it a synthesizer instead of a piano.😏
So how can anything be better than zero distortion? Its tough, but possible in one of three ways.
1. It adds a euphonic distortion that you like.. nothing wrong with this, its what a Piano’s sounding board does.
Cheers George