Arrangement is the invisible foundation of every mix. Before EQ, compression or mastering comes into play, the structure of a track already determines how clear, powerful and emotional it will feel.
In electronic music especially, arrangement engineering is about managing energy over time. A track is not a static object but a progression of density, space and rhythm.
Layer management and contrast are key principles.
Energy flow creates tension and release.
Sound selection reduces later mixing problems.
Good arrangement makes mixing easier and more effective.