The phrase "conceptually crude" can be replaced with a variety of synonyms depending on the context. Some alternatives include "simplistic," "naive," "unsophisticated," "undeveloped," "immature," "rudimentary," and "basic." These words all convey the idea that an idea or understanding is lacking in complexity, depth, or nuance. They may be used to criticize an individual's perspective or to describe a simplistic approach to a complex issue. By using these synonyms, one can add specificity and depth to their language, which can aid in clearer communication and a more engaging writing style.