To have a dual understanding of something would be to understand both (of two) sides. The word dualistic is etymologically rooted in “duo” or “two” (Harper, 2025).
In a philosophical sense, dualistic thinking can reinforce binary thinking, which is limiting and reductionist. It opposes large concepts, such as good/bad, right/wrong, strong/weak, etc.
Reference
Harper, D. (2021–2025). Dualism. Online Etymology Dictionary. https://www.etymonline.com/word/dualism