Both dualism and non-dualism are necessary in this world.
Need we apologize for our dualistic beliefs? Better not apologize in my presence. As far as I'm concerned, as long as we live in a body, both dualism and non-dualism are necessary.
Non-dualism unmasks the true nature of Reality.
But dualism tells us how to orient towards each other. Such notions as relationship, responsibility, integrity, impeccability, and full self-expression are all native to dualism.
Notice how few non-dualistc gurus tell us about those subjects. We are obliged to turn to some of the consummate dualistic gurus in our society to find out how to create a world that works, how to apply the non-dual in the lives we continue to live even after enlightenment.
Notice that we speak of angels by name: Gabriel, Michael, Uriel, etc. Even angels retain individuality and they are a step above us on Jacob's ladder of spiritual evolution. Individuality does not end with the highest human experience of enlightenment.
I acknowledge the place of both non-dualism and dualism in life. If God is eveything, He is surely the dual as well as the non-dual.