Perhaps a computer with a midi setup really is better than a mere mortal pianist with just 10 lousy fingers. Take for example this new recording of works by Xenakis:
"...conductor Daniel Grossman's attempt with this new release to realise these five keyboard works using MIDI technology with a degree of accuracy previously unattainable by the means of physical dexterity alone. Grossman's position as the single mind behind these realisations does satisfy the implicit request of the composer that a unified voice interprets these scores (he could easily have spread the music across two or three pianos). Yet the occasional rigidity and bluntness of the sounding result takes away somewhat from the whole project."
Read the rest here.