Unlike previous versions, 3.0 brought a consistent, rounded-square icon shape across the entire system. Vibrant Color Palette:
ColorOS 12 and 13 are beautiful, but they are heavy. They require RAM and GPU power for blurs, live wallpapers, and 3D transitions. On budget OPPO A-series phones, the modern UI can feel laggy. A (or a theme mimicking its lightweight nature) can make an older or budget phone feel snappy again.
And a ghost, she decided, was better than a corpse.