Change address question.

[just_someguy]

From what I understand when change is made it is sent to a new key.
Is there any reason for this other than anonymization?
I'm assuming sending change back to an address in one of the inputs would work fine but I'm curious why the decision was made to send to a new address.

[Garrett Burgwardt]

Addresses are trivial to make and it enhances anonymity, basically. As far as I know there isn't another reason.