It couldn't possibly be a mistake to study Beethoven. His examples are in every orchestration book I know of. Your making the leap that one would automatically orchestrate identically like him. Wagner who's orchestration technique is everywhere today studied him as did Tchaikovsky, Mahler and virtually every composer that followed him. None of them sound like him or even orchestrated like him or each other for that matter. I can't name two composers who orchestrate identically.
You are saying, study Tchaikovsky and not Beethoven? I am saying study them both. This is a mistake? That seems like a spurious argument in the extreme.
edit: A quick glance at the Adler, Kennen and Piston books shows a ton of examples from Beethoven so I would be interested to know where you differ from these guys.
You are saying, study Tchaikovsky and not Beethoven? I am saying study them both. This is a mistake? That seems like a spurious argument in the extreme.
edit: A quick glance at the Adler, Kennen and Piston books shows a ton of examples from Beethoven so I would be interested to know where you differ from these guys.