I don't agree with your premise. The composition as much art, often more so, than the performance. For most of the music I listen to, including the classical music, I want the performance to be a faithful reproduction of the intention of the composition. For sheet music, you need the performer to interpret, but if he or she interprets outside of well established norms, the piece will sound off.

For electronic compositions rendered directly to a sufficiently precise format (which MIDI is not), you need no separate performance - the act of composing it and performing it is the same.

Since I reject your premise, your conclusion is irrelevant to me, and I don't think there's any chance we will get any further.

I see from other comments that you imbue the touch of a human performer some special quality beyond the qualities purely physical sound generated, and to me that is pure superstition with no basis in reality. You might as well try to convince me fairies are real.