No idea why you are being downvoted, your point is a sensible one to make.
Composers have a 'musical imagination' and often write at the keyboard of (typically) a piano. Classical composers sometimes write music that is not 'idiomatic' for a particular instrument; adjustments follow. From the original article it seems as if the composer had a definite idea of what he was after and adjusted things until he got close.
What interests me about the original anecdote is the use of random numbers in the parameters, and the difficulty that the composer had in reproducing a particular 'state' of the sample.
Composers have a 'musical imagination' and often write at the keyboard of (typically) a piano. Classical composers sometimes write music that is not 'idiomatic' for a particular instrument; adjustments follow. From the original article it seems as if the composer had a definite idea of what he was after and adjusted things until he got close.
What interests me about the original anecdote is the use of random numbers in the parameters, and the difficulty that the composer had in reproducing a particular 'state' of the sample.