Why do a Fosse show without Fosse choreography?
It's not his show. He choreographed the original. It's not his show. There's no doubt that Fosse's work was brilliant - but Wayne Cilento just did a poor job. If we only do revivals as they were originally staged, it would get kind of boring, since Fosse's choreography for this piece is already well preserved in several places.
THE PAJAMA GAME is also, by your standards, a "Fosse show." Yet, look what Kathleen Marshall did with it. Obviously, "Steam Heat" still has the Fosse feel, yet it's re-invented. It's the reason shows should be revived - to reinvent them, not just do what's been done before.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson