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Critical Update - Add a Namespace Prefix to Query Parameters and pageReference.state Properties

There are several posts on this already, but none of them have a conclusive answer.  The wording of the Critical Update info is ambiguous to me.  My questions are:
1) Does the Critical Update only affect code in managed packages?  (One of the other threads says that this CU broke code that is not in a package)
2) Does the Critical Update only affect Lightning Experience?  (If I'm exposing Lightning code in Classic, is that affected or no?)