On a basic level, a CLI with color adds visual information that's easily seen at a glance. In this example blog post, the author shows how adding color to `df`

On a basic level, a CLI with color adds visual information that's easily seen at a glance. In this example blog post, the author shows how adding color to `df` resulted in an immediate visual distinction between mostly empty and mostly occupied space, which would normally require scanning a column to find. Icons? It's easier to show information in a smaller area when you can use the spot a character would take with an emoji or equivalent.