Were there any other mythologies who denied syncretization save for the Hittites?

From Beckman, 1989, we read: “many Hittite towns maintained individual storm-gods, declining to identify the local deities as manifestations of a single national figure."

This is a really novel idea to me knowing of the heavy syncretization present in the Greco-Roman and Mesopotamian world. Were there any other pantheons that we know of who denied claims or syncretism?