Without going into a lot of detail, I suggest a reading of Lydia Goehr's "The Imaginary Museum" to answer your question. It is a very important work for understanding the transition from a concept of music as craft, not as a "work" that is a composer's personal intellectual property, to a concept of music as "art." And Beethoven is the key figure in that paradigm shift.
Larry, I'm quite familiar with those philosophical positions, since I've read them in many books and essays.
I'm not saying I completely reject this "theory", but it didn't fully convince me. I don't share many of its implications. For many reasons. I agree on the fact that Beethoven introduced individuality, and
"twisted and expanded the forms and techniques of his day (including fugue and counterpoint) to serve his expressive needs"
in a way was never done before at the time. But I think my agreement stops here.
Whether a composer conceive himself as a craftman or a God messanger, a Saviour or something else, to me has no bearing on his musical genius and the quality of his music. Great music has always existed, as I said.
Said that, I'd really like to read the book you named. Unfortunately I didn't find an Italian translation, the only way for me to get to it, it's through Amazon.