I also dislike them taking out the Animals rights issue from the book. It is so central to Elphaba's character development, and without it I never quite feel as if the musical's Elphaba is as dedicated / extreme / inspired to oppose the wizard. It takes out a lot of the depth that I loved in the book / novel's version of Elphaba (no disprespect to either Idina or Shosh).
But I loved that Elphaba did not die in the musical (personally), and because it IS a show and a commercial product dependent upon audience approval etc. and without that uplifting ending not as many people would have liked it and it would not have done as well commercially...I understand why they changed / added / clarified it.
"If you can talk, you can sing...if you can walk, you can dance."
- T.K. Greene