Consequently, there would be only one context which would be considered from the synoptic viewpoint, namely, the whole of existence. Dialectics, of course, often transcends various false dichotomies, and thus it would be easy to arrive at the overgeneralization that it transcends all dichotomies. They serve the cognitive function of differentiating two mutually-exclusive and jointly exhaustive subcategories of existents within a given category, and of cognitively integrating members of the same subcategory into a single conceptual unit. They are indispensable. However, given the abstract nature of this topic, it may help if we consider a much narrower instance of a dichotomy.
Some animals are dogs.
Some animals are not dogs. All animals fall into one and only one of these two groups. As such, we have a dichotomy. But by dialectical transcendence, we can overcome our prejudices and preconceptions, and regard all animals as both dogs and non-dogs. The process of cognition is not something which can be performed arbitrarily, not if knowledge is to be its goal.