simplistic; schematic; diagrammatic
Describes an explanation, view, or representation that reduces complexity to a simple diagram-like form, often implying oversimplification.
His explanation is too simplistic and ignores the complexity of reality.
This schematic classification has too many exceptions.
Compound of 図式 (ずしき, 'diagram' or 'schema') and the adjectival suffix 的 (てき, '-like').