I would agree with all of the above. I think there is a fine line between composition and improvisation, especially when it comes to electronic works, as it is often not apparent to the audience, listener or even reader (depending on how it is scored), if individual electronic sounds are being produced manually or processed electronically.
While my preference is more for the hinterland of electro-acoustic, classical forms such as spectralism (Grisey, Murial, Levinas, Dufourt, et al.), I do enjoy individual pieces by more purely electronic composers, like Paul Lansky (Night Traffic, Ride), and musique concréte pieces by Luc Ferrari (Presque Rien) and Bernard Parmegiani (Die Natura Sonorum)…