Because it is the sound creation in the end that is analog I assume. You could create a musical instrument from a digital source -> 3D printer. Let's say a flut

Because it is the sound creation in the end that is analog I assume. You could create a musical instrument from a digital source -> 3D printer. Let's say a flute. It would still be played analogue and the means of creation do not matter at all. I am not an "audiophile" but I assume this is the reasoning and it is perfectly understandable and logical.