Sure, if you want to make it about the engineering accomplishment rather than the music itself. Somewhat to your point, I guess I have more respect for Rainer Neugebauer and the team actually attempting to put this performance on than for John Cage simply writing it down vaguely.

Totally agree. I think Cage's work is vaguely interesting in an abstract sorta way, but the actually interesting part of this piece is the organ itself. I think they're both art, but I personally value the latter more.