"No one honestly would expect it to be the same as onstage"
Except every twelve year old girl who bases her life off of Elphaba's teachings...
And really all I can see for "Defying Gravity" is Elphaba like taking off through a window screeching and grabbing a broomstick. Maybe it could work. But on paper, it sounds really goofy.
"Your lyrics lack subtlety! You can't just have your characters announce how they feel! That makes me feel angry!"